Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f8002983ce1739…

MALICIOUS

PDF

74.5 KB Created: 2021-04-07 22:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8b898c97d0f5b674f02cbf300bdcd31a SHA-1: 511f4fe0845dbeeb7091b9b42c9d109c5e9d45a2 SHA-256: f4f8002983ce1739f472b17f0aaa9bf81e88395e8e5b8a57fe49112417023556
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://jumiwimov.ru/123?utm_term=c+difficile+guidelines+uk PDF link annotation
    • https://cdn.sqhk.co/rifibimilo/vgjajaz/22849713000.pdfIn PDF document text
    • https://cdn.sqhk.co/lefidotoxono/fheAsCp/nujowunituxadiwu.pdfIn PDF document text
    • http://registrat.space/97929281358a7llh.pdfIn PDF document text
    • http://blog-millionaire.buzz/37781385024x1v4y.pdfIn PDF document text
    • http://marketitaly.info/vegan_gluten_free_lunch_ideas_for_workgdtpv.pdfIn PDF document text
    • https://likimipezerejo.weebly.com/uploads/1/3/2/6/132682052/xagawapo.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/bjeihjd/air_hockey_pucks_and_strikers.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/4003409.pdfIn PDF document text
    • http://bepajizijuxiz.iblogger.org/26498133369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_605023be62987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_6057f8c9dd454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_60669c4f1bddb.pdfIn PDF document text
    • http://jumbochecker.com/gewujivakiwe63z0s.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/xijazog.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/xukonakefules/voice_chat_games_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/24646125443.pdfIn PDF document text
    • http://robexekipojop.rf.gd/bollywood_full_movie_2018_3gp.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_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 4852 bytes
SHA-256: 0669642f4aee025d9759e19d3f83dd24c321b708358b7dea2ba5c222c0a7c0e1
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 10996 bytes
SHA-256: b9a542593b90184b44150074d3eb150160ebbf372b59a2188771bb0e99cf7ce5

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