Malicious PDF — malware analysis report

Static analysis result for SHA-256 6562e100322636cb…

MALICIOUS

PDF

83.1 KB Created: 2021-04-10 17:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b3f27e72a3d218fe364769f3c9a17094 SHA-1: 17ea344e1ff591ee7f4a5640236d0009cfa444bd SHA-256: 6562e100322636cb35e65102d47ed173fc4cf43c67da5a6e1b78855df291a956
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary URL, https://midufefew.ru/strik?utm_term=what+is+binary+logic+in+computer+science, is likely part of this scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious, indicating a high likelihood of malicious intent.

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://midufefew.ru/strik?utm_term=what+is+binary+logic+in+computer+science PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499319/normal_5fee731250de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_6032bc8030f45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_602550167ce2d.pdfIn PDF document text
    • https://tariwina.weebly.com/uploads/1/3/0/7/130739483/dfd2ccfb68d3b43.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/7822693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fca2fce45859.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/sgi3iaT/67549972574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_606ac5d7e8c90.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/etHieCT/railway_qr_code_for_essential_services.pdfIn PDF document text
    • https://xudowiwigikit.weebly.com/uploads/1/3/4/4/134462868/abed93c5ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_603f2669256d0.pdfIn PDF document text
    • https://cdn.sqhk.co/bivotiboma/AigCggb/40527927292.pdfIn PDF document text
    • https://xodukibefapox.weebly.com/uploads/1/3/0/8/130873769/ninudiwosenupuzeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fifomi/kezame.pdfIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_081b68a8e5fa447681d1a66c68614eba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/20254762874.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/kujijejutegabigutobipeva.pdfIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_a8e643ba208945e781b195e3d5a80eae.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_f38302d19c6a4b7d8dfa2cf6a3966f26.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 5600 bytes
SHA-256: 9b1e8dc31e3ba924dc785bf414f171de052f9cdad51f037046f1dd6a88cfccea
font_01_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 10992 bytes
SHA-256: 82c4e0bd95c0685eba7fa5750ceb746711cff060910f65406bc3db3ee033a566

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