Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f35061969f48050…

MALICIOUS

PDF

89.6 KB Created: 2021-03-29 12:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6c71b7aa0f78ae65abb3c94de92b7aa5 SHA-1: 4216b81d0cf8f87176d416af6e6dc2ebedbb1052 SHA-256: 6f35061969f48050dc01eb714363d7e412346be82990e9946e019e58c37cfbcf
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 0.9997

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://soxebez.ru/wix?keyword=best+discord+bots+for+fun PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382780/normal_6049543a0fc40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5feb81dd14b2a.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/YjewxfR/71105443662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fd885efa0ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_5fe9f3d92284c.pdfIn PDF document text
    • http://crubr.space/reliability_engineer_interview_questions_and_answerslrno3.pdfIn PDF document text
    • http://nikecortez.net/speed_of_trust_13_behaviors_posternm8fq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_5fe826854a716.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ejdmie9/ninja_games_play_online.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://smotrikino.fun/dikutefavulazapegajn4ep.pdfIn PDF document text
    • http://mestorating.ru/class_3_math_workbook3tocw.pdfIn PDF document text
    • http://copyrightshelpcenter.com/vermont_castings_intrepid_2_parts_listvnu69.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/fnhf13u/89819074879.pdfIn PDF document text
    • http://help-violation.com/kawasokooz5e.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/jehgXhh/drastic_ds_emulator_apk_android_4._2._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5fda6e8c9dbc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_60271694130cb.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/zaxawetawupo/98400040313.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/queen_bed_sheet_dimensions_cm.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/acute_adrenal_insufficiency_guidelines.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_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 4964 bytes
SHA-256: b5c9e7269388dcd89e4c071adc3123a7eb56bf29d1d1c6067c89674ebf8d925c
font_01_sfnt_off0001323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323E 11460 bytes
SHA-256: 42c2a9477b24e02aa6d0cd285ba645835d4e42f3e4781c4e7e2ad792302dd2ac

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