Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfa17db456d1384…

MALICIOUS

PDF

126.7 KB Created: 2021-02-22 07:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f0aab546b0af12f1a346cb35146e818e SHA-1: 9919c76b6efc933bee98dce8bc637c52d3b6691d SHA-256: 0dfa17db456d138408ba6f812b7aa8d4687d8568d7a95106aee8bd0f6fbbe217
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic specifically flags it as a 'Recovery secret / private key request' lure. The document body, though heavily obfuscated, suggests a context of worksheets or answer keys, likely a pretext to solicit sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=practice+worksheet+writing+equations+of+trig+functions+answer+key PDF link annotation
    • https://cdn.sqhk.co/savujegu/dhxijje/used_rhino_air_hockey_table_for_sale.pdfIn PDF document text
    • http://websporizlehd.com/5_cubic_foot_chest_freezer_menardskvuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_602b7128217d4.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/gA3Jics/84578556977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_6024143c88e88.pdfIn PDF document text
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/b1ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495042/normal_5fdec68e6216f.pdfIn PDF document text
    • http://probmake12.xyz/inductive_reasoning_test_with_answersfwj0l.pdfIn PDF document text
    • http://apparentlyopt.com/simple_distillation_of_ethanol_lab_report7w9rr.pdfIn PDF document text
    • https://tebojizo.weebly.com/uploads/1/3/1/4/131406069/mawavuxujoxatez.pdfIn PDF document text
    • http://pravagims.net/88886873182e59kd.pdfIn PDF document text
    • http://startask.ru/creature_of_fenkenstrain_guide_osrsidu6i.pdfIn PDF document text
    • https://wudonazig.weebly.com/uploads/1/3/4/6/134675044/ce0f55338.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/pazovugal/difadiwekuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/9400655408.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/99331636063.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/13936117109.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_off0001b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B633 5496 bytes
SHA-256: b78784b1d55240035ce07d28fe23cf1090b448b26dc59480d8fefcc69e10e7fc
font_01_sfnt_off0001c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8FA 10440 bytes
SHA-256: 1657f0cd80cf7462e3b94f54a581c36428132f4790b94533dff420737bdece7d

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