Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f6bbb50d3a22ac…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 01:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 46bbbcd9384301e4b262a3a3e655fff1 SHA-1: b6af91eb766690ba6926373d5956adc3bd73c940 SHA-256: 83f6bbb50d3a22acf600863cb53d0370c5e7c9878fb8b1cb539a976abcfde5a4
186 Risk Score

Malware Insights

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

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 0.9996

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
  • 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.
  • 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://dafemum.ru/wix?keyword=impossible+quiz+app+answer+32 PDF link annotation
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/xiwisapoxo.pdfIn PDF document text
    • http://hallop.xyz/what_does_proprietary_estoppel_meanvcphs.pdfIn PDF document text
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/wabokeditulugej.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/pisewoxipo.pdfIn PDF document text
    • http://max-lifting.store/hp_elitebook_2560p_launch_date63c0s.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/tulezi.pdfIn PDF document text
    • https://jelulepotaf.weebly.com/uploads/1/3/4/3/134383906/8b961a24510.pdfIn PDF document text
    • http://parkji5x.xyz/wilefes33h.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/8152658.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/8679713.pdfIn PDF document text
    • http://fitdieta.com/what_happened_in_american_gods_season_2_episode_8iyjp4.pdfIn PDF document text
    • https://jabifuvos.weebly.com/uploads/1/3/1/0/131070291/8601411.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/37096642126no264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_7ef874e6287b4c6d8064c49b94752241.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_321416ceafe04cebb35f25829f82404a.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_926ab2a946284e9e99eb71263748e4ad.pdf?index=trueIn PDF document text
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_541bdd160d4345d39e61360d50625c86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovitiku/53572737731.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/50087037304.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_167c4a9b4ea84c0bbe5e54a067142901.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/why_does_nigeria_need_international_aid.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5608 bytes
SHA-256: bb1533b0bc815773d4bfaa63428380f6796430833501cd307f4046f4e50e514a
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 11584 bytes
SHA-256: 3f6cfa79b4026cdd2a41b32af2d3dad7722488201a874e5206804a2b08532009

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