Malicious PDF — malware analysis report

Static analysis result for SHA-256 15831c239c03088c…

MALICIOUS

PDF

71.8 KB Created: 2020-12-19 07:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b312bc1ddff5c978a31f6179e51daa SHA-1: eea99a7aa9eabd39737f9f355db1589eb798118b SHA-256: 15831c239c03088c158d90cda01827806a011967864614750d51ed3a716e42d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs and the heuristic firings point towards a phishing or malware distribution scheme, likely using the document as a lure.

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-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://trafftec.ru/strik?utm_term=acer+iconia+one+8+user+manual
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/wewom_lenavate_wugokuwabe.pdf
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/87747e8d85c169.pdf
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/bupatolonabaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf149b4c4d833b8bc80f0/1606218059145/fotegasezuwajaf.pdf
    • https://uploads.strikinglycdn.com/files/fbc5dd29-8970-4784-a1f8-3c88c57f3334/lusebisuvudifutava.pdf
    • https://s3.amazonaws.com/kosipefojaw/porixer.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/bbc_gardeners_world_episode_guide.pdf
    • https://uploads.strikinglycdn.com/files/56396a62-5adc-4e20-9762-e816fff7e69a/dnde_para_encontrar_hierba_de_bison.pdf
    • https://static1.squarespace.com/static/5fc5c3ea16f6d44b07dfe25b/t/5fce4005662d5e24e0cf3846/1607352327195/zombie_tsunami_hack_full.pdf
    • https://s3.amazonaws.com/xamibudasagas/vilas_county_register_of_deeds.pdf
    • https://s3.amazonaws.com/jedaxopopuko/eden_prairie_girls_basketball_association.pdf
    • https://s3.amazonaws.com/xotomisen/densities_of_metals_in_g_ml.pdf
    • https://uploads.strikinglycdn.com/files/805a2985-b4f5-486e-8854-fbef565fbf74/roliga_lagnamn_fr_fotboll_fantasi.pdf
    • https://uploads.strikinglycdn.com/files/bb5d9429-3b3c-4d34-8dcd-2875c28ac4c9/gw2_gathering_guide.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_off0000db9c.bin
f71adeaf78af49a957be860f40df59bb79a9f3f10691ce88022ffca607c6418f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 5128 bytes
font_01_sfnt_off0000ecf2.bin
911bcab687e13358a5bd4f506bbed18087cc71b1566f5a94a4a2bfb031faa9aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 11148 bytes

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