Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f952e2ed161ee3d…

MALICIOUS

PDF

72.7 KB Created: 2020-12-27 18:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7fca4fbfebfd664fce48e937667a9a9 SHA-1: 5b652796a011b1947f099c52bdd245f8ee22053f SHA-256: 6f952e2ed161ee3dfa51a042875a4d92af7208b32fe15a8356e186955d9e2ad9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm strongly suggest the document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/strik?utm_term=colored+contacts+near+me+costume
    • https://cdn.sqhk.co/rawegili/gdtjcig/41614636567.pdf
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/lujadotelinova.pdf
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/76593cccd4770.pdf
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fe08e83213ce.pdf
    • https://cdn-cms.f-static.net/uploads/4426696/normal_5fe8253d38976.pdf
    • https://cdn.sqhk.co/zafupusapun/UdMX6w4/bus_simulator_2019_free_pc.pdf
    • https://cdn.sqhk.co/kakumipoman/ighahe8/shark_ion_robot_reviews_dog_hair.pdf
    • https://cdn.sqhk.co/kedilexele/1gdjgwk/16563072328.pdf
    • https://cdn.sqhk.co/barugogip/ahaidxL/emoji_art_copy_and_paste_dirty.pdf
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f8c639a3d002.pdf
    • https://static.s123-cdn-static.com/uploads/4369640/normal_5fde4b585683d.pdf
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/a7f75e7.pdf
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5fa67bed0b096.pdf
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5fdb76ed620c2.pdf
    • https://static.s123-cdn-static.com/uploads/4495988/normal_5fddcaadbd9df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c171a96-3f92-4f8d-acf6-18f800ab54dd/study_guide_the_crucible_act_1_answers.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc6.bin
3314ffd4aafdb6db3b6c9595689e4bc793599305b4f8b16eeb33a093fb3fc4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 4992 bytes
font_01_sfnt_off0000f09d.bin
09c769c9e199b64596462e634f155cb5c7faf5e5412058c203fad409052e50fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10916 bytes