Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45d145987600b1d…

MALICIOUS

PDF

72.9 KB Created: 2021-02-28 21:17:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 150c18422798621aca178d7c42ad97e4 SHA-1: a40860197b005a3eabef569780ee46a9a4476185 SHA-256: c45d145987600b1dfca8ad89af8731bc19ab145e48ddb1e683a292c3304c4a7d
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, hints at a 'how to sketch beginners guide' lure, which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=how+to+sketch+beginners+guide PDF link annotation
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/ripatimafonofu.pdfIn PDF document text
    • http://shortsomfj.space/starbound_pixel_farming_guidev77du.pdfIn PDF document text
    • http://zatoboyvibor.fun/communicate_with_your_spirit_guide0ielq.pdfIn PDF document text
    • http://leree6.club/open_houses_this_weekend_pittsburghd8w3j.pdfIn PDF document text
    • http://nadahul.ru/76574021009srzha.pdfIn PDF document text
    • http://flipping-car.online/xiwujamokelagapomdcf12.pdfIn PDF document text
    • http://erethiztzj.space/1207291036cglx0.pdfIn PDF document text
    • http://prognoz-football.club/17788301864id891.pdfIn PDF document text
    • https://jalebipozufi.weebly.com/uploads/1/3/5/3/135320073/f916f2.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/9113460.pdfIn PDF document text
    • https://merokiniperoj.weebly.com/uploads/1/3/4/6/134691049/263890ab46f0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvumudupese.epizy.com/gazejasujob.pdfIn PDF document text
    • http://lelekon.epizy.com/5th_grade_language_arts_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/examiners_report_acca_sbl.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/pasineju.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 5216 bytes
SHA-256: cfebc856c3d036c69e448e104e5149008e7cf0f9047be48f179c370a98db537c
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10368 bytes
SHA-256: 6884250e1e60869040db7c95dafaf663b7cf5241bd6dc641582cf6f386633871

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