Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b28f843d70e7d7…

MALICIOUS

PDF

79.9 KB Created: 2021-03-31 22:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ece5b50f0dc00c2171304408c5a50890 SHA-1: 91908fac864100a36b527c2ac6717dc64330fd6a SHA-256: 59b28f843d70e7d78a1e982f1d61afc11635a4b4f1e7edb020d30e6153354c6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/123?utm_term=before+the+flood+movie+discussion+worksheet+quizlet PDF link annotation
    • http://tujomof.22web.org/crazy_train_guitar.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/501245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_60306ae100194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6039a8a90a739.pdfIn PDF document text
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/a69ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_60602ac69931c.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/7c988f929774caa.pdfIn PDF document text
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/d3ce3465.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/7907390.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/suwokisudexer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_600f02da7c28a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6046ac14e92d3.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://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_1a76c51f3f6b41d596e24b00a15dd149.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/spanish_books_to_read_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/90522613633.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_4c522fb494c04c95a6428b8d91888bcd.pdf?index=trueIn PDF document text
    • http://xafupovavosife.rf.gd/how_to_reset_netgear_wnr2000v5.pdfIn PDF document text
    • http://vitusaw.rf.gd/bulafobigo.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_e3d24386361d4fcfb0dd5a3d9ca9e3b0.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 5376 bytes
SHA-256: 88d4fa45a1b2b513865cfcd0fa14c062ca9ea426a9811cebc39672c332353e87
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 11392 bytes
SHA-256: 51993e198039c1dbf0c47e28021e971c1138ca5f5231f55ad82dab216d5f7796
font_02_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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