Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f42d8cafd7bc98…

MALICIOUS

PDF

81.8 KB Created: 2021-02-23 16:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 76006cabad3b6c69da306df7abae40dc SHA-1: e2edc99b1e0c25fd1000925488b85aad37965356 SHA-256: 44f42d8cafd7bc984b11389c2b79e42d8116d98f9601b996e7d32035f3f0cbdb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the file's creation, but the primary malicious activity is driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=weber+spirit+e-310+specifications In PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5feecc90d254e.pdfIn PDF document text
    • https://negijozizur.weebly.com/uploads/1/3/0/7/130775009/232123f585fd3.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/xoxizuzateruvidomud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_5fd94a8216050.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/edcf7f.pdfIn PDF document text
    • http://magic-spring.com/a_different_mirror_a_history_of_multicultural_america_ronald_takakipbovg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417817/normal_5fcafbb2b1e67.pdfIn PDF document text
    • http://winoraama.fun/sakoxavipinowezibdog35.pdfIn PDF document text
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/vudojogaretav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_6014604494300.pdfIn PDF document text
    • http://dihtyar.online/happy_meal_applesrpild.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492875/normal_5ff4d4f0e9cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_6033eda09a874.pdfIn PDF document text
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/gofobakakifi_lejoveg_bozogogosomub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/61431027905.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/76426580078.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 5520 bytes
SHA-256: aa752633ee1b6cdc9bab004b956300feaa8abd277274087a196d1ac726b17d12
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 12140 bytes
SHA-256: b3e1abcb642060648dd888e094df8d135651424ebf9c863aec532780d6824a77
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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