Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc710abaaf5ded1…

MALICIOUS

PDF

72.2 KB Created: 2021-02-10 23:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3997537df8d56b87857d9dd47262a578 SHA-1: e79e26d43a1ddabd14ae8eab5efc3cd68e479a63 SHA-256: 0cc710abaaf5ded1b63a76800fd4786d7f8e02b3d19d783e11659029479baa2b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users 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://seumenha.ru/123?utm_term=englewood+chicago+food+desert PDF link annotation
    • https://cdn.sqhk.co/mewixamok/iageNii/car_simulator_racing_game_mod_apk_download.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/5149218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5feed34b551c5.pdfIn PDF document text
    • http://in-step.shop/design_and_analysis_of_algorithms_notes_for_mcasiql7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6022bbd632627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5ff877b60ae4e.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuravaxoxi/OS18gjh/57407152042.pdfIn PDF document text
    • http://shoop-ff.ru/machine_gun_preacher_full_movie_freeefzx8.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/jiwogupaxavejom-busudolopepuk-mubuwo-kajoke.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/fidobakipivogit/rhotic_accent.pdfIn PDF document text
    • http://zorogeloma.epizy.com/25454293265.pdfIn PDF document text
    • http://lebevinawefebo.rf.gd/66396074718.pdfIn PDF document text
    • http://borovob.epizy.com/twisted_ovarian_cyst.pdfIn PDF document text
    • http://vewajelawukos.rf.gd/bupalod.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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 5332 bytes
SHA-256: 23f4cca77667b49e503d7cda5a49c5859a2164d001bbd878f0e5a36c69ab1e7e
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 10540 bytes
SHA-256: 14732d69ea12cb6f79128178cfaee50244f76f35f63cd8bd8dca90dbdb01b949

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