Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c5a964e3404216…

MALICIOUS

PDF

78.0 KB Created: 2021-02-18 13:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: aad0ebe8c6e2594253463eb66d6cfa88 SHA-1: b6bb01fcf1d47a99caec7f99a5a6478f2cf4ec69 SHA-256: f7c5a964e3404216544ff4a22815f203c87c150c2e943f3b3d158b47d64f9785
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to search terms and application metadata, suggesting it's designed to appear as a legitimate search result to trick users into visiting malicious URLs.

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://seumenha.ru/123?utm_term=white+tiger+netflix+release+date PDF link annotation
    • http://50offshop.info/gemilowosanujo9dl7.pdfIn PDF document text
    • http://flowerport.store/mathematical_reasoning_filez7598.pdfIn PDF document text
    • http://voyazh-shina.com/vatigepewafog413oe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_60206f7cb7232.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/id0gZjg/wivalegugapepadito.pdfIn PDF document text
    • http://keepxufi.space/ketefotenewerijafukevevukb8x.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/XjaNgdS/best_hashtags_for_followers_on_ig.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/dnjgtij/musicians_friend_stupid_deal_of_the_day.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/RFGSljf/high_fashion_clique_dressup_makeup_games.pdfIn PDF document text
    • http://bosupena.iblogger.org/whirlpool_french_door_refrigerator_not_making_ice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_6011bfede37c8.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/jidjhig/freedom_doom2_wad_download.pdfIn PDF document text
    • http://samozanyat.info/cisco_sg300-10mp_factory_reseth7x8q.pdfIn PDF document text
    • https://cdn.sqhk.co/jusupovexewa/Dgc6BL8/zifowejowazavidurarajitaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404296/normal_5feb4da5d2eec.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/uggghhj/700c_wheel_size_bike_computer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupituf.epizy.com/rerawediposivanape.pdfIn PDF document text
    • http://pomirunorejuso.epizy.com/wefatopubifomusiwediful.pdfIn PDF document text
    • http://riramemixezu.epizy.com/bemarifemepamuvew.pdfIn PDF document text
    • http://goxosabewap.rf.gd/how_to_pair_jbl_soundbar_to_subwoofer_sb400.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 5248 bytes
SHA-256: c1302ea90f41b85022b2b887ea6a97b5bc7abc84f3b1dee3d767b834846300eb
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 11164 bytes
SHA-256: c1cd8270da0387153f8de23d5d0e137cb175e241d99eb2db8fa0198b66dc2427
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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