Malicious PDF — malware analysis report

Static analysis result for SHA-256 924a86981bede049…

MALICIOUS

PDF

78.1 KB Created: 2020-12-24 22:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4bcbd3491a7dafc7da6bda57211c1e39 SHA-1: 236cbfca79d947ee265019a02e8b8d7c45acca13 SHA-256: 924a86981bede04928ae0da9e4285109e93b401d205f228b4c2e1a3470df3c9e
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 and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains strings related to 'physical science textbook 9th class pdf' and 'wkhtmltopdf', likely serving as a lure to direct users to malicious sites like traffset.ru.

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://traffset.ru/strik?utm_term=physical+science+textbook+9th+class+pdf PDF link annotation
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/bopadabupeno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5f95bb8e12b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_5f937af2d3940.pdfIn PDF document text
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/b344cf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5fc7a2809047e.pdfIn PDF document text
    • https://silolovafek.weebly.com/uploads/1/3/4/7/134724041/6304189.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/4111619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9de4fd-d9e8-43d2-959d-2bf5e14ebafe/wukenusaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef66777-427b-4a77-a846-d679b584af0a/financial_accounting_chapter_6_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/josudu.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/border_radius_imageview_android_xml.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/junji_ito_shiver.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 5676 bytes
SHA-256: 19b766087e5078d17231b62228f029b388d63d354ee3eed6df7ce642ba2ef03a
font_01_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 17736 bytes
SHA-256: 9dfd51037e1d7609db8ca63dafbff1488167f62fb21b1e3508f2d41aa547a761
font_02_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10276 bytes
SHA-256: a75b1ff7688fc57f210c8b0fe462e3dce060088d469f423baca0630554b18c0b

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