Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35151a49736ad20…

MALICIOUS

PDF

72.5 KB Created: 2021-02-10 13:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b24ecbf7f105b458fa91bb84547f14b5 SHA-1: 9686f5542de0f09c63d5561157a8d7c2f24c4752 SHA-256: a35151a49736ad20bc240f24d17002c0be8eb67887640d0f7c9d5f17e1fddabe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the primary purpose is to redirect users to potentially malicious websites.

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://baarspo.ru/123?utm_term=sonic+worlds+level+collab PDF link annotation
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/97520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_601c892306964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5feefc7883f7a.pdfIn PDF document text
    • http://emmetrix.net/egirl_style_guidepw6fd.pdfIn PDF document text
    • http://true-board1.club/multivariate_normal_distribution_entropytoc7e.pdfIn PDF document text
    • http://letxxnx.org/240216973627gbe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5fec37016e03f.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/zekijifebodup.pdfIn PDF document text
    • http://pizolezevudowep.iblogger.org/guvesuregidexuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5ffbf2f1b3fb4.pdfIn PDF document text
    • http://minuette.me/73544728628xoec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_600de4a5cb0cc.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/appvn_ios_9vh6sl.pdfIn PDF document text
    • http://vivoxasoro.22web.org/sokibikakitaweligalu.pdfIn PDF document text
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/5386123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povagemu.rf.gd/67166313357.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 5328 bytes
SHA-256: db8f1ffc04c3716a18274f33c5ae7f49f6b2773bba528ae98f551267063015af
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10472 bytes
SHA-256: b7f41c6a827a52f492c538e26ce3eae2f1eee79cbdddfdd5d6fb361af1770602

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