Malicious PDF — malware analysis report

Static analysis result for SHA-256 836c34ca85802588…

MALICIOUS

PDF

64.8 KB Created: 2021-02-17 19:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7607c7e3fb87536d8e57ec90c04be45d SHA-1: 3a7c51d5a20ef73df604b2211acf2d3c122cc780 SHA-256: 836c34ca85802588fea58e91761ec0f6059ab7ec32dba4980347e00531671507
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/123?utm_term=iomega+ix2-dl+firmware PDF link annotation
    • http://gakivako.iblogger.org/dixovabugigirubulowiwur.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/f9de1d99ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_6016a63e86846.pdfIn PDF document text
    • http://puwofipafemuvif.22web.org/5437721942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5ff9dcba6e750.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/djiqBIo/rifamibomevakazuliru.pdfIn PDF document text
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/gifari-bisuzumone.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/tjdjcCV/incoming_asteroids_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/cjccige/scenery_definition_theatre.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/nzoOihc/download_bgn_launcher_apk_latest_version.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/1574522.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/3bd12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_6029c3c9c567f.pdfIn PDF document text
    • http://yachts-4-sale.com/ratamerejupijolg0kva.pdfIn PDF document text
    • http://realwockyc.info/pinofajonutopowojezomyk953.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/wunolupozsh5k.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/ahaiih3/lany_concert_setlist_2019.pdfIn PDF document text
    • http://repair-telefonov.ru/step_by_step_marijuana_grow_guidefh7d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_5fd7b78fd19ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 5308 bytes
SHA-256: b6a875efaaf62d5620b74eeefaa0382d014785e6c51142ef30c94b6ea251a585
font_01_sfnt_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 10184 bytes
SHA-256: 1afa08cc88ce988c7c0f3278c06b3f76a3d5982af705349b0be95764b38e0d3e

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