Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa56d8c05d6fb83…

MALICIOUS

PDF

82.6 KB Created: 2021-02-19 09:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 52437e584ddf3f2b73790c3231d5fa86 SHA-1: 37f9fc0a47635167abd0c142fd4fd4fdf1e4c4ec SHA-256: afa56d8c05d6fb83257ec883cf12393c4c38c449d1274b73caed47e5309a53c6
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also assigned a high probability of maliciousness. The embedded URLs and the structure of the document suggest it is part of a link farm or SEO manipulation scheme, potentially distributing malware or phishing content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=what+were+the+long+term+effects+of+the+vietnam+war+quizlet In PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/9947937.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/zilorexexil_jesitojojuvoxal.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jjhcjes/duzaxegaruxilugejumadupa.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/iZAjhhg/22872442214.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/iGjey8x/madiwuxid.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/sovinewanaweke.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/lijicii/season_pro_football_manager_football_management_system.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/tewasugupenafanod.pdfIn PDF document text
    • https://cdn.sqhk.co/faxinomitux/jgR8xjj/vex_2_games_77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuponefi/64043569030.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/23467047595.pdfIn PDF document text
    • http://pavinudoj.epizy.com/office_word_business_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/80923026937.pdfIn PDF document text
    • http://xemajerekagow.epizy.com/genadival.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/clerical_award_pay_guide_2018.pdfIn PDF document text
    • http://wefulipov.epizy.com/botofiruwutosizuvije.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/jkbose_datesheet_2018_12th_class.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 5520 bytes
SHA-256: 1a4110bf5c5a02f0ddb535097c59337551ce58d725dbd303c9cce00c933217a8
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 10428 bytes
SHA-256: de6326d0fbbad490bd2f667a81b924139195d50b010878616fe8f50e8aa66339
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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