Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8157181783e04be…

MALICIOUS

PDF

97.8 KB Created: 2021-03-26 06:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc97957d79fdfe46f2142561c98d297d SHA-1: d846a595760d391bf056916170a2c6aa5eabe485 SHA-256: d8157181783e04be1a85aa5a0787ec60b0d929b8388a8fdddacb93cd6ebe1285
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/award?keyword=carnitina+funciones+pdf In PDF document text
    • https://cdn.sqhk.co/mivadunoxo/2gkvjhk/nipudu.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/87hhLOF/65198597998.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/CVghihJ/master_assassin_5e.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/jghe2ji/repajowexubifuxeki.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/fun_ways_to_teach_antonyms0gjuk.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/iy4ihiJ/92390520439.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/ejcibdc/91353654997.pdfIn PDF document text
    • http://fruittea.space/windows_emulator_for_android_apk50bln.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/jbQji0u/6116469102.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/r1icthi/note_taking_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/gejdzjf/kipugebob.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/icO0HVy/ice_hockey_coaching_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/Lf6KCgi/38679361992.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/gdkKXqF/tunativawisag.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ja6gdiF/pugodorujipodelaradusizu.pdfIn PDF document text
    • http://reduslim-sitoufficiale.site/dungeons_and_dragons_5th_edition_corsfzhy.pdfIn PDF document text
    • http://creditreportfast.info/derek_prince_ministries_videosi4l85.pdfIn PDF document text
    • http://goodshopsales.xyz/kiputat8g5r1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_a8f855a0cff14e11ae5eb3af52bbff68.pdf?index=trueIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_36c38517b3654952ad2845a76c2108cc.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_9f4c95bb1cb64a5eb1fcb25b9fe3ab08.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_a868084a3c15430ebc1789f5a5d44461.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_b5c95c79e6164dec9d1f8f3b08b22761.pdf?index=trueIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_180cd68ea0004d618fc6ad403a98e38b.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_5e8e8d3abc9c4cb188f8b10281f47939.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 5024 bytes
SHA-256: 8ffd532bdd3fc4e970fa35cbbec22ca3b8fbc3942a48b1f0d43a0eb784f6f57f
font_01_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 2048 bytes
SHA-256: 5bbfb71e7e79db7713d2dca3d61a529cd6bdf2162d19a91745b024a6fee9cfc1
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 17936 bytes
SHA-256: e8d93e97babb8a21a76ef9b9b146d353c00e99f35dcda4469a0d1e212c4f8283
font_03_sfnt_off000154fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FC 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_04_sfnt_off00016964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16964 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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