Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7bbfa5c1bfbe43…

MALICIOUS

PDF

169.7 KB Created: 2021-02-14 22:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ffa43f1cdf8345c39ff2fd8e5c169fd8 SHA-1: 647dd3569afc9f5e9d1d564e34382bcb3f2d9412 SHA-256: 0a7bbfa5c1bfbe439988fc8439871970f27e9001d5946303c8a59e113c34c9d7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=ann+arbor+travel+guide PDF link annotation
    • http://biomanix.best/temptation_chocolate_images008vr.pdfIn PDF document text
    • http://coolstudent.space/47888942842spmrb.pdfIn PDF document text
    • http://workmonster.net/bupropion_dosage_formszr8wn.pdfIn PDF document text
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/guxevaledaga-xakenojat-sagexudimajo-tegeb.pdfIn PDF document text
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/fuvajewuxanad.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/1303768.pdfIn PDF document text
    • http://com-signto5.xyz/los_diez_negritosebx84.pdfIn PDF document text
    • https://wosufibataba.weebly.com/uploads/1/3/4/8/134866098/pegawerumupebexeja.pdfIn PDF document text
    • http://littlenat.space/95272319526psflq.pdfIn PDF document text
    • http://2220202.ru/logisolatawanuvalefapuysmc.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/484eefe87f5ec1b.pdfIn PDF document text
    • http://helper-badges.com/kaxoxutuxetexazamuvuvjvqpz.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/kevusowubazoto-kesilonididi-bilokav.pdfIn PDF document text
    • http://detonicro.website/safe_search_settings_chrome_androidmtt1a.pdfIn PDF document text
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/6232071.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/bubisifapagefe/free_printable_comic_book_templates.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_off00024543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24543 5004 bytes
SHA-256: f08365ab2e25581e96843306c2fcea21d20e14e81f3ec3360a39b95886ac1e64
font_01_sfnt_off0002565a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2565A 12944 bytes
SHA-256: 3da9449dc0161b767d8fa82ba895b49ec5f6f29c16a4ab8b6eab9aae896a1544
font_02_sfnt_off0002806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2806B 17184 bytes
SHA-256: 7bed50ffd77c5401923dc41c61fa4fad08898d7195686183f67dca4c8a1e4d6b

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