Malicious PDF — malware analysis report

Static analysis result for SHA-256 35326716adff06d4…

MALICIOUS

PDF

82.7 KB Created: 2020-12-29 15:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beea91195422a7232a754c867e6bb3ae SHA-1: d4fad890e0530053818660d6cf8a791fb5634fcd SHA-256: 35326716adff06d4eaa3d91b8c9ad9adfc5634c3f8eeb727cff802b9439d5c69
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or redirection scheme, and the embedded text, while appearing benign, is likely a lure. No scripts were extracted, but the PDF structure itself facilitates the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=best+piano+lesson+for+beginners
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5fb5d9589c5f9.pdf
    • https://cdn.sqhk.co/bujavenizake/cgcgfjg/invasion_of_the_body_snatchers_pods.pdf
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe27f2890f7d.pdf
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5f9d18a80f95d.pdf
    • https://zuxigazazopak.weebly.com/uploads/1/3/4/6/134688762/4875759.pdf
    • https://cdn.sqhk.co/xaxovowupofa/PihCgg1/pamesos.pdf
    • https://cdn.sqhk.co/busanurutar/QnhjdCl/word_life_crossword_puzzle_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fccd2b9d2e4d.pdf
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fe76aef44e31.pdf
    • https://cdn-cms.f-static.net/uploads/4490129/normal_5fb76a3fe5896.pdf
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/4341601.pdf
    • https://cdn.sqhk.co/reretukida/TOHY0kj/nofipevo.pdf
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/fee88794d87.pdf
    • https://cdn-cms.f-static.net/uploads/4384828/normal_5fa4b65e464f2.pdf
    • https://vosomomoratefuf.weebly.com/uploads/1/3/4/6/134614816/344451.pdf
    • https://cdn-cms.f-static.net/uploads/4471682/normal_5fc35f99467d0.pdf
    • https://namonizumus.weebly.com/uploads/1/3/4/3/134345036/6439495.pdf
    • https://cdn-cms.f-static.net/uploads/4405642/normal_5fa5030193a00.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae8.bin
3f5d97b162871f815ce602ad69a64a938d25a1038c3ad3bee37c105e0499a612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 5260 bytes
font_01_sfnt_off00010cd5.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 3720 bytes
font_02_sfnt_off00011839.bin
2c834365a9dfec928ad8dede9a18e1e94c0d676dc75d54fa62003dfa74a4335c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 10872 bytes

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