Malicious PDF — malware analysis report

Static analysis result for SHA-256 5679b3562b80383a…

MALICIOUS

PDF

89.3 KB Created: 2021-03-24 16:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c4cea271d129eee60c9496b888fd9873 SHA-1: 2654dcaa3b66bf98daefe88fbcff425e330c911b SHA-256: 5679b3562b80383a4281e9d87a4f7064d750625a57488e478e2fee013127184c
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm designed to distribute traffic. The presence of a URL with a 'utm_term' parameter suggests a phishing or SEO manipulation attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=how+to+learn+jeet+kune+do+wikihow PDF link annotation
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/8d654c1170b035a.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/dijXje3/mezatikorir.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/fizosoli.pdfIn PDF document text
    • http://abanca-electronica.com/most_popular_android_apps_2019ekcye.pdfIn PDF document text
    • https://cdn.sqhk.co/dobagalenap/i9uZWlH/freeway_ford_denver_service_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/ijarIjf/final_fantasy_xv_a_new_empire_gear_guide.pdfIn PDF document text
    • http://bigops.fun/algebraic_expression_quiz_with_answers48f86.pdfIn PDF document text
    • https://jowanubeso.weebly.com/uploads/1/3/5/3/135399775/liluderuwi-dolowaj.pdfIn PDF document text
    • http://prodson.fun/synonyms_antonyms_homonyms_worksheet_5th_gradeur6l9.pdfIn PDF document text
    • https://waxovabuwemox.weebly.com/uploads/1/3/4/5/134585519/jufemivezidizapug.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/4hYTtJE/contract_killer_2_mod_apk_obb_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_0fc41b6b7ce2490ca41a79fa53cc52ee.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_7a4bc2c20f794a1187cb6fed1bb800cf.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_572dcec9de2f42469e9739ff666555a6.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_9a50ab37c13542a8b1217e1e8e1303bd.pdf?index=trueIn PDF document text
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_d87b20779c0a4f5abbd6d2ae578c3b71.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_acdf81e00463426fa4729d5855062e26.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_75bebdf1f090472c837527576137173a.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_539a7c3b06b24e39afaa62f3a8db85fd.pdf?index=trueIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_bb4c45de24cd4f549e86efb8269bb08e.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_b35932fc0de544bb9a5abdd301b76cc0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 6364 bytes
SHA-256: ff114116c0cc282178e9b9acae841b469e658c24e15c40d1dde60471814fd208
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 4928 bytes
SHA-256: f044912e02762d96debcfd4e9ef560e3ba18a99246a52fb7933d896d64ff113c
font_02_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 12676 bytes
SHA-256: c26cbf8fb51577e35a2c406c88ec6c324610dd4511ca97d5e3c73c8c6aa701e1