Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f7973c695281e3…

MALICIOUS

PDF

79.8 KB Created: 2021-05-07 15:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3b6ff698d6e8a8d75986c7e6a749748e SHA-1: 20c34f96a27ef41ea3b086327bbb0ab999445d4d SHA-256: 63f7973c695281e3ad689db905a14b3ff1e98badf87e65e2a5ceb3768bde1e35
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, a common tactic for phishing and malware distribution. No scripts were extracted from this sample, but the presence of multiple external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=primannum+honor+society+umd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fcf606cd8044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_603d3c3c92977.pdfIn PDF document text
    • http://trikotoria.ru/vamoliwazoiy7j8.pdfIn PDF document text
    • https://ponegibafuzixi.weebly.com/uploads/1/3/1/4/131406662/kifaluj.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/36047213394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492294/normal_5ff13e194e9bd.pdfIn PDF document text
    • https://pomugulawes.weebly.com/uploads/1/3/0/8/130814995/b45b06cbabf.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/247529.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/vejukowar.pdfIn PDF document text
    • https://ludatigesoz.weebly.com/uploads/1/3/6/0/136050408/1757204.pdfIn PDF document text
    • https://nitagupivef.weebly.com/uploads/1/3/4/3/134342099/vinexirokabogeralo.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/62660911268.pdfIn PDF document text
    • http://citruss.space/gefenazululivub3wx8p.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/negirerukija.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/1789fd88cc9710e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_604ab12fb938e.pdfIn PDF document text
    • http://trixy-matrix.space/machine_learning_meaning_oxford_dictionarypr5p4.pdfIn PDF document text
    • https://nuxikasupi.weebly.com/uploads/1/3/4/5/134528480/vetolivanitumin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojibovel.myartsonline.com/kedavuwuxiripakakefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe2db76-4290-4613-8471-84f5a267616b/taleziri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1b7c46-8b9c-47a8-872c-aa4f3d96f25f/1653018864.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/ximijupuzezivogovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbfef4c-11ed-46ce-9d57-f5c84b895734/78730300177.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_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 5252 bytes
SHA-256: 9d4e3c292efea6d383b6a4a527e68ef15fc01e4ff64d4f2c17c2b1a566a05571
font_01_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 10692 bytes
SHA-256: 575f16240b33f84561782cc25ad19222bfba0510bbf1304a2f7d883a7ad2db0f

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