Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7fc42c58539fc0…

MALICIOUS

PDF

74.3 KB Created: 2021-04-09 17:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bdbd3c664b4dc043926e3d315594fd5 SHA-1: bb66e90760ea34c9a659bc7946411205adf71c3f SHA-256: ce7fc42c58539fc0f88b58a5530712db07b66e9229ab7bc9142158093f9f9adb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, many of which are disguised as PDF documents, likely to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to study guides, aligning with the phishing pretext.

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-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://jacksth.ru/strik?utm_term=comptia+linux%252B+study+guide+exam+xk0-004+4th+edition+pdf
    • http://lazadacostumercenter.com/french_revolution_three_estates_worksheett5jkk.pdf
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/5261970f148.pdf
    • http://warewakeb.sportsontheweb.net/gevukudofevidinevewavi.pdf
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/pegojuj.pdf
    • http://pixunune.sportsontheweb.net/xebigajisari.pdf
    • http://fumexijana.getenjoyment.net/a_time_to_kill_book_cast.pdf
    • http://zizubur.22web.org/zawejowigezured.pdf
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/gigojuwu.pdf
    • https://disefiduwixa.weebly.com/uploads/1/3/5/9/135981448/6714014.pdf
    • http://vinograd.io/what_is_the_price_of_the_total_gym_fitewwk5.pdf
    • https://wopixidotawus.weebly.com/uploads/1/3/4/5/134506387/16626d20e33ad0.pdf
    • https://cdn-cms.f-static.net/uploads/4422377/normal_60355c744fc5d.pdf
    • https://static.s123-cdn-static.com/uploads/4416666/normal_5fec7c8a3d604.pdf
    • http://medgaj.com/nurezavujefupegz2a4w.pdf
    • https://static.s123-cdn-static.com/uploads/4379852/normal_5fc9c3b8e5cf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_47e6918b0b2c4c119116a7889e344419.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_65c5525d00164262ba6feaa03504d3c4.pdf?index=true
    • http://lavebaku.rf.gd/catia_v5_tutorial_surface.pdf
    • http://zutugidod.onlinewebshop.net/tewerusukuvu.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_off0000e27e.bin
06cad6b14cd6cee60795fabbe0c8e886818a7444a843a717f7a3bb4ffd7afb15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 5760 bytes
font_01_sfnt_off0000f60a.bin
d4bb6233e25c7c79dcd96e0196939a7305ed93a2dc909949561d8b37763c2015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 11120 bytes

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