Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f76938736ecdf4…

MALICIOUS

PDF

74.0 KB Created: 2021-03-11 16:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6ffa32e1403c412173345cc37b39b66f SHA-1: 9046298fe9d1a77b3a2730be6062d21f1920bdf6 SHA-256: a7f76938736ecdf4615c435aa93a8da24dfae68cd3d7f0f2f47313f630d03a49
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://xajibur.ru/wix?keyword=utah+license+plate+numbers PDF link annotation
    • https://cdn.sqhk.co/wenisuvuroju/q0Bihjf/voxal_voice_changer_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/hihhhbk/78885138607.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/9757799.pdfIn PDF document text
    • https://pafediroloz.weebly.com/uploads/1/3/1/3/131379748/5681331.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/Vqpj8gc/25294273919.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/gghigko/bufuxigexavapisive.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/eOvehhz/kerala_quiz_with_answers.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/xosiri-wujuv.pdfIn PDF document text
    • https://nubizuvilokimid.weebly.com/uploads/1/3/5/4/135401099/7401062.pdfIn PDF document text
    • https://cdn.sqhk.co/pisimebuziz/ihfhjij/nivebajowomoduzimivinoxo.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/629f30da-b81f-4d39-aef1-55d853e68877/tuwepiditukatopubi.pdfIn PDF document text
    • http://gedijusopekud.epizy.com/99864034687.pdfIn PDF document text
    • http://gasigigi.rf.gd/cleaning_checklist_template_for_childcare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592aa414-c148-44f8-a620-5ad9cad8dc0b/why_is_my_wireless_charger_blinking_blue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a072ca35-69e6-4959-8ef4-4f8751820340/how_to_draw_different_anime_girl_poses.pdfIn PDF document text
    • http://wimofuxoba.rf.gd/aerofit_commercial_treadmill_price.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/raees_film_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c05914-03bf-4eaa-8afa-5c4bb702b402/how_to_get_mobile_hotspot_on_at_t_unlimited_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/harlem_renaissance_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110fb2d8-f5eb-46f0-a16f-0ab5e6438fe4/zoparaturiwuv.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/54029606127.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5304 bytes
SHA-256: 2dc182ed75f0ae973b215f5827e96fbd718b8648595f3fc1dadfbf7d7a519162
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 9928 bytes
SHA-256: 29c8aed86f24b0866b5992f682b0319e9eb84f20c6edd0633844822a8e58f89d

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