Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc96c080df00bf0…

MALICIOUS

PDF

76.2 KB Created: 2021-04-17 14:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec8e8c142dc491a42254537472e6f17d SHA-1: 2e80ea852eed559b7a252fa3efd10812c38b4df3 SHA-256: 8fc96c080df00bf0fdccdb99d20e835794de7ec0fb3204abe23e6d3c783a15dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The primary URL, https://soxebez.ru/strik, is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure suggests a malicious document intended to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=what+do+density+currents+do
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/mubululex_ruvelaruk.pdf
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/mumesufix_narilepazolu_sexanuwojavatik.pdf
    • https://jesimubevudoku.weebly.com/uploads/1/3/4/8/134873829/mopijodel_guvuz_vujipodolezizo.pdf
    • https://sejuxotanodefif.weebly.com/uploads/1/3/5/9/135957191/puxeze.pdf
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/riduxikubawemato.pdf
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/bemubaxakipeb_mumid_kukisufax.pdf
    • https://pikemane.weebly.com/uploads/1/3/4/7/134775920/78fdbdf9.pdf
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/fc1feb8f.pdf
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/0f85547807d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rufonali/temiza.pdf
    • https://s3.amazonaws.com/gurafoga/fobalolo.pdf
    • https://uploads.strikinglycdn.com/files/bc6a2248-c492-4a3b-a904-b1ceb68b0ab3/cisco_ccna_test_online.pdf
    • https://s3.amazonaws.com/sisaxu/average_income_of_a_wildlife_biologist.pdf
    • https://uploads.strikinglycdn.com/files/2de9e68b-759b-4bda-8a3b-782c211f6e84/kakuwodav.pdf
    • https://s3.amazonaws.com/punurum/61716540633.pdf
    • https://s3.amazonaws.com/gotitibekovi/46868340135.pdf
    • https://uploads.strikinglycdn.com/files/0df19ed8-21e7-4342-be72-31306ce249fd/best_hyundai_car_service_center_near_me.pdf
    • https://s3.amazonaws.com/risisipajole/nezonokevonuf.pdf
    • https://s3.amazonaws.com/xugigabitulu/76011920467.pdf
    • https://s3.amazonaws.com/dazifozixawus/22332860942.pdf
    • https://uploads.strikinglycdn.com/files/0cb0452d-aa70-4673-ba48-528a84bd6fca/what_might_you_have_if_you_dont_feel_well_worksheet.pdf
    • https://s3.amazonaws.com/rovuweraja/hindi_to_english_translation_practice_set.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_off0000ed91.bin
2f4c2ed7e4ad56f1f5e4ccd3dd4bea947291d550330b483ba8c2498df484aff9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5108 bytes
font_01_sfnt_off0000feff.bin
d42930693a6a048966ca488dea7b0bc9e02f3d74d0e7d4957270fe6e44737f42
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 10576 bytes