Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef77b0f13a86087…

MALICIOUS

PDF

69.9 KB Created: 2021-04-11 22:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e41065f3da4082281b14d06e86ea27b5 SHA-1: b16722c84cb4c3abc6a3f7ac57c83af3cf1ff4c3 SHA-256: 4ef77b0f13a86087fab5a393156d92be39c3651e349b2bd27e6bbd5ef46936fa
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 0.9998

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://xajibur.ru/strik?utm_term=is+it+going+to+be+another+twilight+movie PDF link annotation
    • http://bagerisevi.scienceontheweb.net/mazanulime.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/7qvkxgc/wovepivubidakazadofofo.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/ugjzT9x/62171768631.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/aehdP1F/character_story_planner_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5fcaf736123ae.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/how_to_unlock_ge_top_load_washer.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/zovomabuxavusopoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_602f8f037ba7b.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokiwil/jyls7bt/mitima.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/ba291016-2f99-43e7-bb55-6e39c9bd6a80/why_is_negotiate_so_important.pdfIn PDF document text
    • http://mivurukelino.onlinewebshop.net/75366892247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b47d69-4d67-4a1a-9b12-7665f65ea346/what_agile_software_development_methodology_introduced_the_sprint.pdfIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_78cce7177f424349b6b491c92d793644.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4899f54d-486d-4858-8518-076bcced7a13/name_that_angle_pair_worksheet_answers_all_things_algebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f654fbbd-cb9e-4d45-a016-5b1c25886a7b/review_qcy_t1_pro.pdfIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_0c6cc064cfbe435aa74b59bca6b04af2.pdf?index=trueIn PDF document text
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_bddce4fb3b23431f90bd2040ae52201d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fec73a-45a1-429d-8585-69bcf1b4c5dd/best_diesel_transmission_shop_near_me.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_d403fc6218ff4dc6a556ef24e94f893b.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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 5328 bytes
SHA-256: 9312fcb155e9d40ec4c6084729a9f671c4e6e3f345f61d8ffd491ec10c8b495c
font_01_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 10784 bytes
SHA-256: ef95d95e5a69aa0f7c1f780c4b4e1995a71ca59c76fc138dd6d256bf726cea67

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