Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8564632fa8f815…

MALICIOUS

PDF

76.2 KB Created: 2021-06-02 06:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c92f1700a0251c5502006efaf58f9ffa SHA-1: d9eb99be73bd19ee155312dc0e3c005f562534f1 SHA-256: 6e8564632fa8f815b83082e12b3731b46f5481eb2558d7533010dfe794651244
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. While the document body is heavily obfuscated, the presence of numerous links to other PDFs suggests a tactic to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wufezaju.weebly.com/uploads/1/3/0/7/130738917/2976018.pdf
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/3805078.pdf
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/zaviwal-lovumopim.pdf
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5feb1577778ed.pdf
    • https://cdn-cms.f-static.net/uploads/4375199/normal_60480d39370e4.pdf
    • https://static.s123-cdn-static.com/uploads/4469104/normal_6001cc7980d30.pdf
    • https://cdn-cms.f-static.net/uploads/4458614/normal_606ea92970748.pdf
    • https://xasopivuzag.weebly.com/uploads/1/3/5/3/135333163/fokokatijulosope.pdf
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/kupukexexisofe-gafeloba-jobafitadevi.pdf
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/ea675662.pdf
    • https://cdn-cms.f-static.net/uploads/4486037/normal_602fc09ae5da9.pdf
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/pefusejamizatele.pdf
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/6225885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=what%20is%20the%20definition%20of%20capitalized%20cost
    • http://tarogifere.pbworks.com/w/file/fetch/144487338/how_to_make_a_joint_venture_proposal.pdf
    • https://uploads.strikinglycdn.com/files/acb149b5-9b0d-491f-b980-863465d9b1c5/93607596544.pdf
    • https://uploads.strikinglycdn.com/files/44b942cc-be6f-4240-8bee-c97ffcc3eb89/12072386662.pdf
    • http://wixugigir.pbworks.com/f/576733143.pdf
    • http://kelivesas.pbworks.com/f/volume_formulas_for_3d_shapes.pdf
    • http://jujirafamena.pbworks.com/w/file/fetch/144465525/68435177367.pdf
    • https://uploads.strikinglycdn.com/files/6ba8938b-2d7f-4ca8-833f-33d9e975631a/finugagaxubuzibas.pdf
    • https://uploads.strikinglycdn.com/files/b293414e-13d3-4bc0-9c5e-951b96756a6c/que_personaje_de_cazadores_de_sombras_los_origenes_eres.pdf
    • https://uploads.strikinglycdn.com/files/612c7e45-af08-4322-a8ee-7ce7cac9d336/financial_accounting_for_mbas_8th_edition_easton.pdf
    • http://jopamedet.pbworks.com/f/doxibiditupur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca9.bin
945b690e7bc23da1f02c6e9b2a5275f9989fda4ed9e449599164cdc7d8d1cf30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 5208 bytes
font_01_sfnt_off0000fe7e.bin
db1c74e3ba0dd2cf372c2ec111a0c8235cdcbb049706aa7bfc867c4366f7cf33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10792 bytes

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