Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90fa7ee6d02d7df…

MALICIOUS

PDF

68.6 KB Created: 2021-04-02 03:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: afbc4bd49cb472de845336abd1521105 SHA-1: c36898787ea363f553b8345b28ed71bd29b742a4 SHA-256: e90fa7ee6d02d7df4904fb64e7f63380bcd1a563d689ecfad80eb387581adff3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's intended to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7937

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 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
  • 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://zajinet.ru/aws?utm_term=ep+thompson+the+making+of+the+english+working+class PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60106731e0ba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_605bf57e156e7.pdfIn PDF document text
    • http://shoop-fo.ru/31471507491r9g66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_605a700c43326.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/1689413.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/wezowuren.pdfIn PDF document text
    • https://pisilobeko.weebly.com/uploads/1/3/4/7/134728547/retugesezumima_fuwodulad.pdfIn PDF document text
    • http://fridgeservice.ru/bosch_glm_80_display_problemco583.pdfIn PDF document text
    • http://xonigej.mypressonline.com/tamer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_6064ed19bfd62.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/808b602517b3.pdfIn PDF document text
    • http://goodxday.xyz/at_what_age_is_the_human_male_brain_fully_developed7cgk4.pdfIn PDF document text
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/buwoko-fufawevageg-kunamoveb-vomakuxax.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/d6ac00e4ec38a8e.pdfIn PDF document text
    • http://zootime.store/code_breaking_puzzles_with_answerscgie2.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/85e24a5.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/by_laws.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/fibuveri_dijemededuvabi.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/237fe.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/nidogusaravirutigi.pdfIn PDF document text
    • http://baderakavakuf.22web.org/golomopurafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duwagisu.epizy.com/hitchhiker_s_guide_to_the_galaxy_book.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 5332 bytes
SHA-256: cfac06814340201423b02f0fd767e315debfe4c30dc174969a6b14dc1cfdf89a

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