Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84b992d68347dc2…

MALICIOUS

PDF

83.2 KB Created: 2021-06-10 00:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b319b43f2fede8bd5542032a8fc4e449 SHA-1: cfe920ba6c86600316d71869bc7895c850e0904c SHA-256: c84b992d68347dc23954ed37f24176325c7e94dbe156e8865fcdc5b4a8e01b30
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious websites, possibly as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://pixomot.ru/pbw?utm_term=french+conjunctions+pdf PDF link annotation
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/1558287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_6017167ae5b01.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/fitekagaxu.pdfIn PDF document text
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/536bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487623/normal_603256906b1b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498983/normal_5fd3ab3383edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_605c6b867b6ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fdceb89416e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_6046631646431.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/9035702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_602169c524232.pdfIn PDF document text
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/kajodogux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_60175e8172ff0.pdfIn PDF document text
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/wanupawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5fe752e6005ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_60620654233e0.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/fezemat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuxanoguk.pbworks.com/w/file/fetch/144704883/30237124093.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144762840/what_does_rational_religion_mean_in_economics.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/w/file/fetch/144605016/74394661915.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144866118/fejafoxonijefenepagogo.pdfIn PDF document text
    • http://rutarotovez.pbworks.com/f/newspaper_report_example_igcse.pdfIn PDF document text
    • http://noxixap.pbworks.com/f/gunawajonapekotapak.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144596646/earn_to_die_2_hack_mod_apk_android_1.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
    • 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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 3312 bytes
SHA-256: 707f044220626673030db1e929683b7e6be6df4515348478205ae719871ec17a
font_01_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5032 bytes
SHA-256: 54b5f9dd45fac41f1a4ffe4a0b3a8868535c4a873248a7adc5c1ba2037bab770
font_02_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 13236 bytes
SHA-256: 3b1708a6bd940f8d06fa2c67327474327b37141b84db0fc84cbb3c4a2bd8f5e4
font_03_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 16684 bytes
SHA-256: a858ad06ee9285ef990c8ccf5509e6bce71cae8afc7f99ba8a1dcaf33198b628

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