Malicious PDF — malware analysis report

Static analysis result for SHA-256 35228fb0c8a93f18…

MALICIOUS

PDF

81.7 KB Created: 2021-03-16 04:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6814cf05ecbdfc0537b42be0cee78194 SHA-1: 796270054809a7e2f5e267cc4dfa75acc22a9c19 SHA-256: 35228fb0c8a93f1864b8f92786e38f38f6588f58b7648ba17611dd0ca2cb425a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one points to a suspicious domain ('crophysi.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute content. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=coleman+evcon+dgat070bdd+manual
    • https://static.s123-cdn-static.com/uploads/4456676/normal_5ffaafb7ef674.pdf
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6018bbf52bbd9.pdf
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/zogipijulesem.pdf
    • https://cdn.sqhk.co/xaripisi/hbsjdgh/norigilelokevegilada.pdf
    • https://cdn.sqhk.co/tutabalero/d3gcejj/sound_analyzer_app_download.pdf
    • https://cdn.sqhk.co/wesaduleb/bEdhecj/silvercloud_byu_login.pdf
    • https://cdn.sqhk.co/turanexode/tyZibia/pudegovogofepikanereli.pdf
    • https://static.s123-cdn-static.com/uploads/4493200/normal_5ffe8b033bf2d.pdf
    • https://static.s123-cdn-static.com/uploads/4487423/normal_5fc950e2e2485.pdf
    • https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/mirezozimovitofi.pdf
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5fe75bfcab110.pdf
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fc95e143648d.pdf
    • https://cdn-cms.f-static.net/uploads/4446507/normal_60222631a7629.pdf
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fd9515bb7024.pdf
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/vijosaporotupaxava.pdf
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5fc6a966677fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jovekus/emma_jane_austen_summary_and_analysis.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/metformin_in_pregnancy_pcos.pdf
    • https://s3.amazonaws.com/kumasala/wofaw.pdf
    • https://s3.amazonaws.com/fajixe/what_is_english_contract_law.pdf
    • https://s3.amazonaws.com/fizup/aggiornamento_android_smart_tv_akai.pdf
    • https://s3.amazonaws.com/jotizifime/introduction_to_english_language_download.pdf
    • https://s3.amazonaws.com/supefujoxopubu/26767633671.pdf
    • https://s3.amazonaws.com/petikamov/dunexolivakakof.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_off0001026e.bin
cb3d623be3ee12ee8c3a0844afbb2928f44d5a77afeaab24b76051a298f0031e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 5312 bytes
font_01_sfnt_off00011472.bin
c44b55ba1a8adf6d057938beffaa89f323ce3f1f1f0a368719bf0a28e8bc2c47
pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 10824 bytes