Malicious PDF — malware analysis report

Static analysis result for SHA-256 9508694586a822f0…

MALICIOUS

PDF

83.9 KB Created: 2021-03-22 16:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 20d93f621a315cb66e34003d3925f26b SHA-1: a748bb5745a4f82bcefb305e159b030de1bb6967 SHA-256: 9508694586a822f077f9ee7e5e898af1755152f87bd2680df485af3e242fa888
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/award?keyword=bsc+nursing+entrance+exam+paper+pdf+download PDF link annotation
    • https://cdn.sqhk.co/nuzozuni/WjfjcFJ/lugavanebawili.pdfIn PDF document text
    • http://kukilafixe.22web.org/jalukorigefab.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/jdhaZgi/48329659522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_602efd0265572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_601a45851313b.pdfIn PDF document text
    • http://sazaxizixukuju.iblogger.org/how_many_days_can_a_dog_go_without_eating_or_drinking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5fd69c98a1446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_602939dc36de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fd3db8a6bd40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_604b61ee45cf6.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/hjtjf9Y/56123367730.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/khanlV3/crazy_s_foosball_challenge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601f9e6fd4ff9.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/FhaFmhg/border_patrol_pay_raise_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bevomozovedem.rf.gd/how_do_i_fix_overscan_on_my_samsung_tv.pdfIn PDF document text
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_5b6a6965b99546c08446bf0efd0a1a94.pdf?index=trueIn PDF document text
    • http://dimaninerif.rf.gd/penatoworekiw.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_a522e8a892704ba289eea504d4ba2056.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_dbc899b844b441f3ab33fa4a9bf2be44.pdf?index=trueIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_75ecbf2b387248c7a4f22fedff4cf53f.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_88e8a545ba794001bce9552121de5dba.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 5684 bytes
SHA-256: 844541ec255d84117dc0827eb7674461a5e5f490fb89aedd504b3386caa63078
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 11316 bytes
SHA-256: 41a1d95d048677291612d4ffa73f33fe3660e62d56582ef47d4a569251f51afb
font_02_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140
font_03_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 3392 bytes
SHA-256: 2221c96e18a4e8eb06a9f4ba58fcdb8ce97a7c3e3b4ec82bfb7a69e311d578f7

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