Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67ef15ab13eb2da…

MALICIOUS

PDF

73.7 KB Created: 2021-02-24 05:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c3a1fbd584cd691dc5e4cd3e5b7ba656 SHA-1: 5d61753f6ee5ab31cb74e3c6fdbb7bc112950880 SHA-256: b67ef15ab13eb2dac2f51730794cbdfa8e4e7d271a3c46d254d87d48f1c42832
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains a title that appears to be a deceptive lure. No scripts were extracted, but the presence of numerous external URLs and the overall malicious verdict strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=how+do+apple+use+lateral+thinking PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5ff78c35ebfb4.pdfIn PDF document text
    • http://13millions.store/73097669343ukjsd.pdfIn PDF document text
    • http://espaceclient-cmb.com/what_is_a_mole_chemistry_quizletzmd8w.pdfIn PDF document text
    • http://oneshops.space/vijapugazaxegolxkh9s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_6019aec939d14.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/2241647.pdfIn PDF document text
    • http://it50off.info/shortcut_run_game_unblockedhw06l.pdfIn PDF document text
    • http://skout.tech/dbt_training_for_therapists_online63bs2.pdfIn PDF document text
    • http://goldenframecollision.com/vijenocp02s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5fd07b28ccf5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fdc073c698d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fe42ca01c6c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_60306b94b3045.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/kajasezugojupekug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_600e2449ea9c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 5340 bytes
SHA-256: 68c0108a00c3721f44ac96e7e4ef93e2a4767e1b1b14739b23880a78488d07f6
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10548 bytes
SHA-256: ccd4a83993603f4ed4833c63532e8f137008017605a974cb237b5ede2cae75bf

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