Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6faf3080c3e4e9…

MALICIOUS

PDF

80.4 KB Created: 2021-03-28 20:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 27373a43d182e8258a2fe8d80cb740c3 SHA-1: b6b5907d337b9a48025f2f647be4a251b8c5b62f SHA-256: 7c6faf3080c3e4e9f605db0090624c289810112823b13f9a69ed3ef997904461
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 hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV heuristic strongly indicate maliciousness, likely for phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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/award?keyword=amazing+spider+man+comics+pdf PDF link annotation
    • http://bettyloustintruckbbq.com/respuestas_del_ejercicio_91_del_algebra_de_baldorwk0l1.pdfIn PDF document text
    • http://bachanalytics.com/jazz_chord_progressions_guitar_chordsbbm6m.pdfIn PDF document text
    • http://zomusip.iblogger.org/shakedown_the_score_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_605f28f9e9451.pdfIn PDF document text
    • http://xajoxirutojik.iblogger.org/badger_in._english_for_work._everyday_business_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455387/normal_6005e6d91d839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5fc88d092b3e5.pdfIn PDF document text
    • http://puferimu.22web.org/how_do_i_reset_my_roomba_s9.pdfIn PDF document text
    • http://narelarijejale.iblogger.org/tulunitomekowekegelexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468814/normal_5fc5b4a1715ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/725fc4e3-9e58-4182-9487-31254dbb02d1/is_skyworth_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0ceebe-1e91-43c4-8f1c-f82e69ecf4df/oxford_rhyming_dictionary_online.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_29ec7588b789403d9c6f75a1ff2f6fd8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bda06c-2269-4ac8-8d4e-e106f70cbfb3/62594254289.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_558f17ee103a4d36a4f91f372b165aaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c8880f-bbe0-40f2-beef-72d3f9a02fa6/mugup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8fd9adc-5692-4fba-a271-a62e57c0c9f7/96195856069.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_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 5484 bytes
SHA-256: d6c054981a213b07d94a05d9191580e38254636a72bd4eef106631f9c09d058c
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 11380 bytes
SHA-256: 5a7418836923faa67448227a51f400fc25ae4739ef0688a25553ced4418a10c9

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