Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bfe31f6d35a410…

MALICIOUS

PDF

62.8 KB Created: 2021-01-27 18:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb4fae98830ad5bdd06fce8f8cff46f SHA-1: e746e64c51bdf34713cced5e3b175d2340dd2bad SHA-256: 88bfe31f6d35a410973002eeb6465b314091d6c1bb59ef6c793ca488a8a46399
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary function is to redirect users to potentially harmful external sites.

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://maypoin.ru/123?utm_term=army+jcr+log+tm
    • https://cdn.sqhk.co/kerosumumato/adgjibV/19816625940.pdf
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5ff135f6a2fad.pdf
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/soden-zugipu-pokadevizinune.pdf
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/b5b4a429a5994.pdf
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5fd7ebd188239.pdf
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fcd04cf46f3f.pdf
    • https://cdn.sqhk.co/fasotaluvose/lhchalf/zobikela.pdf
    • https://cdn.sqhk.co/jowapezo/uwidjac/78601327525.pdf
    • https://cdn.sqhk.co/seseniluvus/Fig4hj3/promo_for_walmart_grocery_pickup.pdf
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fd2e431a2aa4.pdf
    • https://cdn.sqhk.co/lilaxikixo/3R8gekh/punugukarodawemasidupex.pdf
    • https://cdn.sqhk.co/zibusisujij/xgjTcif/alien_space_jump_game.pdf
    • https://cdn.sqhk.co/vipabure/OgWhchd/rise_of_kingdoms_guide_app.pdf
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/9096525.pdf
    • https://static.s123-cdn-static.com/uploads/4388611/normal_5fe320ceb3ae3.pdf
    • https://cdn.sqhk.co/nuzinipaz/jhgd0ig/pisaruporobelabufow.pdf
    • https://cdn.sqhk.co/nonuripot/QhhBKPs/55343534376.pdf
    • https://static.s123-cdn-static.com/uploads/4367959/normal_5ff6b0e2469b6.pdf
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/243197.pdf
    • https://cdn.sqhk.co/vemetafije/PibiiSs/pandemic_unemployment_assistance_florida_requirements.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c5.bin
bbd1cc7c2e30e1c8ab5c051c80ca4319fa65cbede5234210ecc05af4c3da3ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C5 4896 bytes
font_01_sfnt_off0000c96b.bin
3f498415850267df08aee0e59906bca64f49b831c0e22269d92e9a19ca8ced20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 10484 bytes

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