Malicious PDF — malware analysis report

Static analysis result for SHA-256 c122caaee8890566…

MALICIOUS

PDF

55.7 KB Created: 2021-03-31 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9273b6335d6590d5d8bd96fd194d0598 SHA-1: 67d87a023ba75aafa9838d55c1f30c6a892f6e93 SHA-256: c122caaee889056685a948faedfcb426e5e972ea514c5579886fa22c73826e16
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, several of which are flagged as potentially malicious or part of a link farm on disposable hosting. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using algorithmically generated URLs for malicious purposes. The ML classifier and ClamAV detection further support the malicious nature of the file, suggesting it's used to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9503

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gimoguvi.ru/award?keyword=asset+turnover+ratio+analysis+pdf PDF link annotation
    • http://hrushch.space/mevatasasagopibewub74cd.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/c040d.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/2021023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_605d424e6d0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_605b055f41159.pdfIn PDF document text
    • http://vigastlens.xyz/cosco_scenera_next_forward_facinghe27s.pdfIn PDF document text
    • http://francobusiness.com/muvelumewulofoxisusunilimwjixq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_6006905aba809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_6025004f83919.pdfIn PDF document text
    • http://storeeu.info/davax83a9m.pdfIn PDF document text
    • http://afracheat7.xyz/69813960770z5t51.pdfIn PDF document text
    • http://complect-tech.ru/dexofamid3oj7k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_601dbd3138510.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/d46b9701a2.pdfIn PDF document text
    • http://niwopofe.scienceontheweb.net/lajitunofez.pdfIn PDF document text
    • http://bio-ita.fun/weber_grill_rotisserie_replacement_partsnoynv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3022b562-2d04-4ba3-93ed-842bb82371bb/commercial_electric_digital_multimeter_review.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/barupiredatamemosewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b53f5a-9f26-4146-98ad-5aee3f30de5b/navy_subspecialty_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57cc625-9fff-462e-9dd4-b30743142667/what_setting_should_my_cpap_humidifier_be_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50b3016-cf16-456e-af1f-76a28d13dee2/lukibowujatenugoso.pdfIn PDF document text

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