Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e7bcfc73a79c8a…

MALICIOUS

PDF

68.9 KB Created: 2021-03-01 02:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1c5103226f3605ee9ddba44eb3979d SHA-1: 03291e68a55e5d42a66e146ea974a8e057c570e3 SHA-256: 90e7bcfc73a79c8a28b66235838ba3ef3559c6117578f6066e16c7a387f9fc4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://ponafet.ru/strik?utm_term=hayward+blue+essence+20+salt+cell+replacement', is likely used for phishing or to redirect to further malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', reinforcing the phishing and malicious intent.

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://ponafet.ru/strik?utm_term=hayward+blue+essence+20+salt+cell+replacement
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/romixamidapotenu.pdf
    • https://xawaviwuxuj.weebly.com/uploads/1/3/4/2/134235980/287037d9.pdf
    • http://sarkife.site/17091485177wus4i.pdf
    • http://wamuwosola.mygamesonline.org/26365344409.pdf
    • http://vevaxogejaz.scienceontheweb.net/vector_mechanics_for_engineers_statics_dynamics_9th_edition_solution_manual.pdf
    • http://familyit.info/how_was_the_sabre_tooth_tiger_adapted_to_its_environmentl2uw4.pdf
    • http://jonebukusopovet.mygamesonline.org/bizijotapepesezivesaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timeziso/17046180006.pdf
    • https://s3.amazonaws.com/xezonijida/by_far_boots_reformation.pdf
    • https://s3.amazonaws.com/telasebisu/which_party_ruled_india_most.pdf
    • https://s3.amazonaws.com/potofaw/93954170891.pdf
    • https://s3.amazonaws.com/xomepixo/ballade_des_pendus.pdf
    • https://s3.amazonaws.com/tobojelusiwi/graco_click_connect_jogging_stroller_orange.pdf
    • https://s3.amazonaws.com/kovilowab/401047070.pdf
    • https://s3.amazonaws.com/ligole/example_report_internship_uitm.pdf
    • https://s3.amazonaws.com/bejexe/64747121810.pdf
    • https://s3.amazonaws.com/jitimesolagun/barbie_girl_ringtone_free.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_off0000cb52.bin
994e58281925ffc55c8798c495bb3a145a88d61d47eed9460cdeccfcfde28d93
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 5788 bytes
font_01_sfnt_off0000df01.bin
987358788018d007aefd91f4e1c17e834610d7b50c509b1068074138696fc958
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 11072 bytes