Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d0a8a607523f29…

MALICIOUS

PDF

76.8 KB Created: 2021-02-18 13:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d4a4e718c7ff25f8cd82a9a13b774bf SHA-1: 0e9b807da2becb3dfe96101b97c00aa37e7f4622 SHA-256: a9d0a8a607523f29d3605cb3c5dba053509487f2eaed850d591908f70316084b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains to obscure the true destination. No scripts were extracted, but the presence of external URIs points to the document's intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=partnership+by+estoppel+easy+meaning PDF link annotation
    • https://cdn.sqhk.co/zarudaletok/jaw2Ahg/20664352167.pdfIn PDF document text
    • http://ejqy.com/xedijupaxowemavigoxoroxojvo5l1.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/gavhhic/65229986735.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/f47b4e30da.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/2Aje79j/jetedenuxife.pdfIn PDF document text
    • https://cdn.sqhk.co/kixeworu/etYatji/41819794029.pdfIn PDF document text
    • http://mnogoturov.com/canon_lide_700f_driver75xbp.pdfIn PDF document text
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/gokororumexowavigi.pdfIn PDF document text
    • http://dfds.in/proof_by_david_auburn5e0af.pdfIn PDF document text
    • http://wbigs.space/pocket_arcade_story_dx_mod_apkwzc1n.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/tirivibimo.pdfIn PDF document text
    • http://zoompol.xyz/idiomatic_expressions_with_tener_answer_keyjljuc.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/hbgfU5O/torotasodogozesufo.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/Mggjc8c/audiotool_tutorial_pulverisateur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 5264 bytes
SHA-256: ca3d27ab49049b436d2d037f1aaabe3b169e3774acaca5ccc7b4def224806fa6
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 10808 bytes
SHA-256: dc4ecf26cde2b4950414271384c51a54e9006689648b725d2416a4317d9ebd69
font_02_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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