Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a7f3ac71d4a9cd…

MALICIOUS

PDF

79.7 KB Created: 2021-04-25 03:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f109639eb31ce57dc2d8f32fa2772127 SHA-1: b95fac5e0d858e42e49c299bffe54e1f80f20b49 SHA-256: 57a7f3ac71d4a9cdcc4c51d135345c7808f8380f0946b0bdbb4e58437c08dcdb
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 0.9996

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://dugedepap.ru/strik?utm_term=can%2527t+play+dvd+region+code PDF link annotation
    • http://palopepidek.mypressonline.com/adenosine_mechanism_of_action.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5ffdffc1cadb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6017dbb4f0007.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/what_is_an_electric_motor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484815/normal_5ff66ca9ae13d.pdfIn PDF document text
    • http://qlemelest.online/valoliwac1g82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_604e9d1fdce1a.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/abacus_maths_tricksc3e5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416301/normal_5ffe8247c2383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_605447762d5e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_601847cd1edf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_600a3e7d39c2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_18dcfa8d1c7a45359435ffb99f584ccc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8847fcd-8562-4108-aa17-c2a39d2b13ec/apc_es_550_silence_alarm.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_10c06468fb3d4403991b2397cb44f1a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c109a844-0b1f-449d-959e-45b177e8e15c/how_to_change_formula_milk_for_newborn.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_2fba36caf8d14156a3e70e1ee5c88869.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_0246cb599a0744fb8bbe01fd7874738b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2751b69d-adea-4978-984d-7153e657da93/gimet.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_b92c9b259965457ba647d2d90e863e50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6b3016-2124-469a-a82e-980679cb0ac5/harry_potter_y_el_prisionero_de_azkaban_resumen_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b981f9c5-e5c7-45e7-bd09-55135a9ec47b/64263871033.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_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 5164 bytes
SHA-256: 230479cc9fe4cd0158ed92f5de1aa9fb25418f8bfecf6adbc07eefd216dbbe13
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 10872 bytes
SHA-256: 150c61210b783fea2d5314933a5a333326d0a658874675163072eee194683c3c

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