Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c5ed207cbf2df1…

MALICIOUS

PDF

78.5 KB Created: 2021-03-04 21:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 10b05919bf588ea6c64eb1a3084d7a52 SHA-1: 42248b484df7acbca2864425a6a140970d59781c SHA-256: 43c5ed207cbf2df11b458ecd9382f6f39272994a0240dfa8d0dc6b0e595ada29
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of a link farm and a malicious redirector strongly indicates an attempt to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=the+book+thief+markus+zusak+pdf In PDF document text
    • https://cdn.sqhk.co/vedimurami/nIbvyjc/diy_mask_kit_joann.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/jj5jhii/rutenuwaguditimogala.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/wivupilu.pdfIn PDF document text
    • http://gprofights.ru/xegazigipuxa7gzqu.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/96945904803.pdfIn PDF document text
    • http://nikaold.site/70510913449sa98n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_8978d4f4f8af45d59dd45f3d81720d58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5507dc6d-b6a0-4500-9227-a6b82ab5749f/tableau_course_singapore_poly.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_96f9591f110244b1b7ef3603ff1a5885.pdf?index=trueIn PDF document text
    • http://nejimafalun.onlinewebshop.net/9685442494.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/37485509309.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/69539166513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0dae5d-90d9-4a89-be77-a8393e10a56d/twisted_fairy_tales_snow_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bace892-a3c6-469a-a2dc-c7c735932290/how_to_check_solenoid_on_ezgo_golf_cart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef45600-b243-48bc-aa58-e52df2f01692/samsung_rf4287hars_xaa_ice_maker_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3143c58e-c0b6-4bde-a383-917e95c69f30/24467802717.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/narabijoxudodig.pdfIn PDF document text
    • http://segimoto.myartsonline.com/40115220699.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 5452 bytes
SHA-256: 58c9ec243b0087e27bde0e5fdc332f40282c2b24fbc131f7792519ed3b744eec
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 10304 bytes
SHA-256: 0d7328de718c757f2d8048653c5b46d45593134b1a792facf1a988b158c82a66

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