Malicious PDF — malware analysis report

Static analysis result for SHA-256 663bba11bdffc0a3…

MALICIOUS

PDF

73.9 KB Created: 2021-02-19 10:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e7de58935ad90624b5714774abe56671 SHA-1: 5a723aae5be533ae7437972df43ca25f1013f900 SHA-256: 663bba11bdffc0a3dc037fd9656a145e778c24454297e019313e988a3e80be76
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, likely intended to redirect users to malicious websites or for SEO poisoning. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=henry+stickman+stealing+the+diamond+unblocked+games PDF link annotation
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/verudexinizu.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/hmtSot0/stick_unblocked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/iGIRhcP/zetanukonunef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_60195866d414a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_6009789285f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_6021a544b8be1.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/1icImBr/82897663076.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/349083f9aa.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/boxatozoxufiden_monen_wamamevawitaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_60157e44d44ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5fe91e971abdf.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/hjidwgf/punirubetivilubamoz.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/yHShbdl/real_car_parking_games_3d_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_60109536ced80.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/a27f9e8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_600d64991e1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6011fc434339a.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/xesobevuziwon-redut.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/rubidokezive/masonojizafisepobalas.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/aisha_songs_songspk.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/27788063165.pdfIn 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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5620 bytes
SHA-256: 9a669eee5104bad8f0ed3c8c9fe59aaa8d74384cef8ef093efeb4ddcf285ff19
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 10720 bytes
SHA-256: 235f3091607d19c2684dbe404408db6a3848583b9877434b97c3bd599b390a99

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