Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2c26fb3e20a917…

MALICIOUS

PDF

72.5 KB Created: 2020-11-10 18:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4e01a9f616ac58cca162c64388fa6ebe SHA-1: dd85997454ee31a2de6e35f864f3d952bef0ab82 SHA-256: bb2c26fb3e20a917a0971af825fc7b53ded770740df190d16de11c2c6f66af36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services like Weebly, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains, a common tactic for phishing or malware distribution.

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://traffine.ru/123?keyword=aamco+oil+change PDF link annotation
    • https://ruxibero.weebly.com/uploads/1/3/4/4/134403554/valekuvimamadot.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/wajuzoxag.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://wiliwakura.weebly.com/uploads/1/3/4/5/134596421/lifumegejapewozonib.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/jazulifevalosu.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/puriwe.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/e30b60acb786f0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/22dc5687-2d7b-4a61-a4f1-234e146d2141/nabawawetuzenuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d3f971-11cf-46ec-90f9-1523f55363d6/tejuzutigakuderemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100a933c-958e-47c8-adb5-fffc7e02497a/kevipez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a035c0-7ba5-404d-92a2-9bb400f7839a/snakes_in_palouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1bbd14-d4a1-49a2-8338-e692bad93b88/kieso_intermediate_accounting_chapter_13_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c810f5-783c-458c-9e3d-2e72777af5d6/39359705631.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_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 4636 bytes
SHA-256: 4237bce4b6eea5d323a807c3c945cce5f445712e2e0075fa980e99177af0f930
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 12284 bytes
SHA-256: 381b3e8526aa3fa268c23d956b0cc7fa4a21d5707c1cb846112e79af6ae2bc08
font_02_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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