Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e11c9e95c97596c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 12:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d29a0a832a5526d09ccfa9115316fe82 SHA-1: c52d66314c889675115f5333338dfae22226d883 SHA-256: 2e11c9e95c97596c0f24b6bd0912c219f8337715cc2529195358f035a353f072
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social engineering tactic for credential theft or malware installation. While no scripts were explicitly extracted, the nature of the link farm and the lure heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://druttle.ru/strik?utm_term=the+12+week+year+brian+moran+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/waximanodif/djbiggh/81874967388.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/jdvOeFc/party_city_coupon_in_store_august_2020.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/how_to_earn_free_valorant_points.pdfIn PDF document text
    • https://cdn.sqhk.co/moxofudifafi/ifkIijp/anticoagulante_edta.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/stand-up_comedian_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/hif4xid/geobook1_bios_key.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/43jdipY/14951749149.pdfIn PDF document text
    • http://ruvejufagofo.22web.org/mathematical_riddles_with_answers_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/kilatelazobe/iDiagib/6878003727.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/ZhgOjjH/bollinger_bands_trading_strategies_that_work.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_760a99b775ff4c2da3638d1efccbeb80.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_9a8b6ea517aa4baea63535769b2c5a40.pdf?index=trueIn PDF document text
    • https://274e0329-8a83-4376-85d1-fe7e07dbc583.filesusr.com/ugd/a86d68_28e2013465664d67ae05ff37ad60d152.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_e17164dd11c346a8aa4d5b091ed01ea8.pdf?index=trueIn PDF document text
    • https://7c2a7e5f-de2f-4207-b822-d971188c697e.filesusr.com/ugd/17f605_ed207517e5f2471080b47ec157b406ea.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_1737e22f2f824bfdb015d92bcfa162cb.pdf?index=trueIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_ab3b099efc584c03b5d83dd9e5821e9d.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_f8ef3d5b3c61460da6f3dffddfc06d1f.pdf?index=trueIn PDF document text
    • http://walerofudovewir.rf.gd/razukokoror.pdfIn PDF document text
    • http://dozonexupiwef.epizy.com/54465193885.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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 5636 bytes
SHA-256: a5d8d1fdfefa90e10d302ae55ce1902072e8dbcd8be2ab1e025b38855d8bf0e0
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 11656 bytes
SHA-256: 8e1526014ca5519cc23836ddbbf757120f676fd297a71b77780f2c209a6a2f76

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