Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39677ab3cc4090a…

MALICIOUS

PDF

99.3 KB Created: 2021-03-19 06:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f855545772452f58fb04591a8d5cc7c3 SHA-1: e9e94f864411fc3e7d706e4dadc044642dbfea5d SHA-256: c39677ab3cc4090acbc2f4759e4167b944717f4d788d7b4e9adcdab092fd426e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=how+to+do+civil+engineering+drawing+pdf PDF link annotation
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/5064198.pdfIn PDF document text
    • https://xetibipu.weebly.com/uploads/1/3/4/5/134528590/2611289.pdfIn PDF document text
    • http://rabota-plus.club/76938664921hi14h.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/4jaichb/my_movie_my_superhero_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404976/normal_603c8814adea0.pdfIn PDF document text
    • http://yourbigdick.space/kimofofomenubetikagerhyn4.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/RJghhdt/68714984343.pdfIn PDF document text
    • http://mists.space/university_physics_for_the_physicalnlkzx.pdfIn PDF document text
    • http://zodimevumu.22web.org/rosoduvazezutixem.pdfIn PDF document text
    • http://balifruit.com/bakhtine_esthtique_et_thorie_du_rojge51.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/fx00Zhj/basketball_court_length_in_meters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460045/normal_5ffa310c30600.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/i1idjhJ/61937578384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_601733f2d119c.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/midie62/idle_theme_park_tycoon_terraformed_island.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_6018f3e98215e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_603a082ddd583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_730eac8dc73449f68fb7ebe36cd0a00e.pdf?index=trueIn PDF document text
    • http://pabisuf.epizy.com/ruzoz.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_80fca55e28c54e3abf3f94ce9f0f6ab5.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_9bfb883f80d64bd9b3a673d2eb5f78b9.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_off000144cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CF 5260 bytes
SHA-256: 20a3029b4890c13ec0dbe1b923adb534f3d66069edb9e8554f8166a99bca908c
font_01_sfnt_off000156da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156DA 11604 bytes
SHA-256: 19b5871ab3d633ae82d9c356c4859ce7a05a653ec43cf8aa7a18089e626d5d7a

Open this report in the interactive analyzer, or submit your own file for analysis.