Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3566aa6218c66b…

MALICIOUS

PDF

75.4 KB Created: 2021-02-20 16:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 957e82b86f0c0e9709081cefe64668d8 SHA-1: 77f1f7a889049a2d03a1712e886e42dabc3ff4cb SHA-256: 6e3566aa6218c66b56a3589f9b840d613e6981cca0abbd7b51e283a50b3f51c9
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown reputation URLs strongly indicate malicious intent. The ML classifier and ClamAV detection further support this assessment, flagging it as a phishing trojan.

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://leonvi.ru/wix?keyword=htc+phone+manual PDF link annotation
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/1674298.pdfIn PDF document text
    • http://wimixolumow.iblogger.org/vancomycin_dosing_guidelines_stanford.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483624/normal_5ff624e359293.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/rigavisapewi-manuselefideti.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/5428466.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/0863d7.pdfIn PDF document text
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/5747ae35f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_6024b9e2ca60d.pdfIn PDF document text
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/561ceb58.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/0bdfe493e.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/aKIagjc/dino_run_no_internet_game_online.pdfIn PDF document text
    • https://ratudizog.weebly.com/uploads/1/3/5/3/135323835/6049dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff216866a03d.pdfIn PDF document text
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/vijelal-vuletekedinor-xotorori.pdfIn PDF document text
    • http://bitawulam.iblogger.org/golds_gym_xrs_50_home_gym_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_601b294b2cbb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gisatazab.rf.gd/66820643105.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/chatswood_station_platform_map.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/compound_words_worksheet_for_class_5.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 4860 bytes
SHA-256: 66ab7dcbe80fcbbc273e81952fb7375d667f8189506297b3bb4dd9bd363dc5cc
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 10564 bytes
SHA-256: 8ace309dbcee29e284f77a8bd2c6ca1076bcba546da16f6502c7ad088859eb7c

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