Malicious PDF — malware analysis report

Static analysis result for SHA-256 906840d256ccf6dd…

MALICIOUS

PDF

72.7 KB Created: 2021-04-22 02:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7d68c3e841915436662979f781741f83 SHA-1: c3bade9ca92d21921eeaa26a1d7af9c2c833e419 SHA-256: 906840d256ccf6dd0300ad4a9df74d4b72fc79a891968cb866ddb2ede4dc0623
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, possibly related to a user manual, with urgency language detected by heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/strik?utm_term=neve+1073+dpa+user+manual PDF link annotation
    • https://rewemaxokaw.weebly.com/uploads/1/3/4/7/134748572/5ff1b304527201.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/9917725.pdfIn PDF document text
    • http://fixmarker.fun/sniper_warrior_shooting_games_sniper_shot_gamesywyti.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/mijaduxejipidelimuno.pdfIn PDF document text
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/didojom-vodanovelibi.pdfIn PDF document text
    • http://worldworkbook.com/navivubarwg1xy.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/kokoru.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/93083472899.pdfIn PDF document text
    • http://badgesverified.com/84937768493zuqom.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/cardiomiopatia_hipertrofica_felina.pdfIn PDF document text
    • http://obzorov.site/40_rules_of_love_quotes_rule_3jif6l.pdfIn PDF document text
    • http://anstel.pro/infraworks_training_guidebpo08.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/muvukuxofovi.pdfIn PDF document text
    • https://xepepewidejumu.weebly.com/uploads/1/3/4/6/134669023/2bbc8f5fac33d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupimegoroze.epizy.com/is_google_making_us_stupid_nicholas_carr.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_d73660fdb4c6414c9543b4b08ee99500.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_437279049db54b3fb8a9b154da6ed02f.pdf?index=trueIn PDF document text
    • http://pexarazeju.rf.gd/rufedulak.pdfIn PDF document text
    • http://mopasumugenivev.rf.gd/6702605385.pdfIn PDF document text
    • http://defoxusen.epizy.com/cartesian_product_example.pdfIn PDF document text
    • http://sozogakuvigoxev.epizy.com/zumifosasubuna.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_c9b7e1ff27274737b60469c68c0198ab.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_ee32047f319b4b1fa31dbf41ca0d4f81.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_cc66c7f2ae284f73912a4be5e094a33e.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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 5572 bytes
SHA-256: d95bfdc58565f9bab82415f7fb88f793d692cf1e238778f1024ef9f4cdd9c339
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 11196 bytes
SHA-256: a86cb98c1f86a86c9f967b62e899857f00fdf4729d45a525d68b581755599049

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