Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9b52173752740d…

MALICIOUS

PDF

74.0 KB Created: 2021-02-15 01:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 93836c6d8784ea551a31050999e09b92 SHA-1: d622068eb46a2254f424971fe94cdb242f5cc74c SHA-256: 2c9b52173752740d25b8096af6f0de66ce7e9a7d970169c11f6445f80672a05a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO abuse. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect 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://leonvi.ru/123?utm_term=ge+washing+machine+parts+manual PDF link annotation
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/zuwido-lirolu.pdfIn PDF document text
    • https://jasasexu.weebly.com/uploads/1/3/1/1/131163864/kilode.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/fbihhdT/neon_traffic_signs.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/nazawevure-rojakogofojap-xajobetidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fd787800b7da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_6012b1db14a60.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/3538809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakokaxawizepu.epizy.com/matlab_basic_programming_questions_and_answers.pdfIn PDF document text
    • http://gisinazujawapub.epizy.com/eulogy_for_dad_template.pdfIn PDF document text
    • http://depolavebusep.rf.gd/gidipan.pdfIn PDF document text
    • http://fupofew.epizy.com/bose_quietcomfort_25_instruction_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5472 bytes
SHA-256: 19b740147b68f85406255bfc05cdccbecb09011d09b4c6f7f7444a0e2848f4d8
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10316 bytes
SHA-256: cc2ffcff87b560fc0ec957116a79c7045f72c3e55fc53848b6f7a07f1bbc90f4

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