Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7083733adee39c1…

MALICIOUS

PDF

79.2 KB Created: 2021-03-21 11:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 168f24439bb122fb7d0b1deef1c3012d SHA-1: 20abf9c9c430066ee5ab0b663ed05be88f4c9519 SHA-256: a7083733adee39c1661468db14a7abab787e2b8e8b193b2b2bcaadce6e8a6773
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 0.9998

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://bologen.ru/strik?utm_term=lowes+careers+hobbs+nm PDF link annotation
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/lisusolim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_6029d3e3d7930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_6017b5b6306f7.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/Tuihhh5/diversified_machine_systems.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/8eb6006043e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_5fda6253cb2ba.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/ggjgFjf/activ_racer_tabletop_simulator.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/kategasigol.pdfIn PDF document text
    • https://cdn.sqhk.co/duravukikemo/jRhf8L3/call_of_duty_world_war_ii_zombie_gameplay.pdfIn PDF document text
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/255814.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/sasufufa/betevekixafogenos.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/nexoliwiwusemeg.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_fa167cef2345469bb0fbf85bd1a082a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/63460888250.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_4df70447cb6546ea9d495a54850aa443.pdf?index=trueIn PDF document text
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_4ab1280635da4fb7b832c4ad527171ac.pdf?index=trueIn PDF document text
    • http://vitefetejovo.epizy.com/declaration_of_independence_analysis_answers.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_8ac24f4a6c634b52a94881c98f2579aa.pdf?index=trueIn PDF document text
    • http://fepufikegag.rf.gd/pesopivagipuzixagu.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/zujiwe.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_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 5180 bytes
SHA-256: f05cdb6dc35448244d04de9a279b65d85a2935e1cd74f8b395929b81dbd9ee8d
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 11120 bytes
SHA-256: 301ac5d383947a00e547c84ab696d1c967e96d8beac08626247bcb5e393f1402

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