Malicious PDF — malware analysis report

Static analysis result for SHA-256 91aa95ad2272b2fe…

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 09:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10da9d2bfeba7615f254d419614c3259 SHA-1: 1f5d8dc85bef6fa76b5778326397be02d14bac48 SHA-256: 91aa95ad2272b2fe0a34d77c7b1cd59211c5324a8e6437bb46b907d7d65714dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vibangnhadat.com/uploads/files/89906389927.pdf In PDF document text
    • https://rumusjitu.com/contents/files/32534816503.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/2755278633.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/debunazamono.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/93497699887.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/45034933368.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/80186862330.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/wawelaguwitonupigik.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/nlpn1cv490imo7lolnieuis1s3/xuvevoripegiduwowod.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/mopedokimegugul.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/fosapuxinakitetosurudinu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496fda4ad7c---sakutuxojabirodo.pdfIn PDF document text
    • https://trexanh.net/upload/files/ponijoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=locker+codes+2k20+nbaPDF link annotation
    • 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://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_off0000d059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10556 bytes
SHA-256: b8671d46397d6ce67b5cb25a253ead64823885a53cf1b71fc828027a0385b1ed
font_02_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 17672 bytes
SHA-256: b25935baa06bfccde1360e28a480080079b73938b9086494f7d037a5ab4a8070

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