Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab64fb8ef4641a7…

MALICIOUS

PDF

62.5 KB Created: 2021-06-02 00:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f6c8086231b09957120a714bc74efc2 SHA-1: 7124d399921df9f51481e57a5374a1c567c715e0 SHA-256: 7ab64fb8ef4641a74711cf8292a673f8b9c7f439e244162a757846f8697a56b6
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing unwanted content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8467

Heuristics 4

  • 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
  • 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://archism.ru/pbw?utm_term=ielts+academic+writing+practice+test+with+answers+pdf+2019
    • https://cdn-cms.f-static.net/uploads/4384480/normal_606750d2324eb.pdf
    • https://cdn-cms.f-static.net/uploads/4416305/normal_602b6a339ccd1.pdf
    • https://felixitu.weebly.com/uploads/1/3/4/0/134012625/fee3ecb951d1c0.pdf
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60401e16e88d7.pdf
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/gososefisu.pdf
    • https://cdn-cms.f-static.net/uploads/4403413/normal_601d5d866ebba.pdf
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/3573756.pdf
    • https://static.s123-cdn-static.com/uploads/4413455/normal_5fc77176d5ee4.pdf
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/gajuri_nosebumomom_nojinuviko.pdf
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fe2535ea20df.pdf
    • https://mosatidopo.weebly.com/uploads/1/3/4/7/134731439/ef29efac14.pdf
    • https://cdn-cms.f-static.net/uploads/4454682/normal_601d151c83ab0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banusiv.pbworks.com/f/vexoxu.pdf
    • http://gatasulupu.pbworks.com/f/rajakeraguzapuxiwili.pdf
    • http://magogopowo.pbworks.com/f/is_dish_network_good_for_gaming.pdf
    • http://mibegenav.pbworks.com/w/file/fetch/144466455/how_to_fix_comma_splices_and_run_on_sentences.pdf
    • http://siruzosu.pbworks.com/w/file/fetch/144449520/14831485928.pdf
    • http://bilabegape.pbworks.com/f/master_organic_chemistry_study_guides_free.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144473190/what_to_feed_baby_blue_tongue_lizards.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0b.bin
7e4e317d2dde3e5b8b0ac1048c9259612559bc01c7830b84b9eeeac06f6f6aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 5756 bytes

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