Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcb9a79f0783ebb…

MALICIOUS

PDF

80.2 KB Created: 2021-03-26 08:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c0185109a5b1d2a690336bafd564c6ba SHA-1: 23d75e23a3b3482c89fc0ea6d6963bf13e4d2bd8 SHA-256: abcb9a79f0783ebba5be7294415091d6ce654ab87fffdfa48441a53b143f533a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=fender+mustang+3+footswitch PDF link annotation
    • http://winfreeiphone.xyz/easy_jeopardy_questions_and_answers_printablenxjqr.pdfIn PDF document text
    • http://boxberry-24.cc/50244133100n79p3.pdfIn PDF document text
    • http://esagafow.fun/boss_tu-2_manuale_italianor8hw0.pdfIn PDF document text
    • http://myyshooop224.site/venumavesuwupabosawifu741kr.pdfIn PDF document text
    • http://doordash.fun/7199867621m6u2k.pdfIn PDF document text
    • https://cdn.sqhk.co/wofutajo/gcSzMkD/42163464524.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/noban.pdfIn PDF document text
    • https://lisokafi.weebly.com/uploads/1/3/4/6/134694643/4140260.pdfIn PDF document text
    • http://missunik.space/tyranny_attributes_guidebfvwx.pdfIn PDF document text
    • https://cdn.sqhk.co/lanamixese/iheih0v/running_fred_apk_mod.pdfIn PDF document text
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/71489c7f69872f.pdfIn PDF document text
    • http://yazansoft.com/ansible_and_extractwymg2.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/zukinupofa.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/1giqgjP/71893547144.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_fcac50bf437f497faa97b35c21b0fc33.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_ec0708538ebe4a7a91a9766c5cfba97b.pdf?index=trueIn PDF document text
    • http://bekonoxidolu.rf.gd/economist_april_2020.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/57856656066.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_4270f32deff7419ea3c26bbbc1522798.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_583428d6c1c8432e8522e5719fe5326b.pdf?index=trueIn PDF document text
    • http://sobikunukozi.rf.gd/aoc_monitor_e2752vh_manual.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 5612 bytes
SHA-256: 3f08d954cfa0f0e917dd10badfd7a96102b581b6ac36a62cd4d0db8a1d77d332
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 11940 bytes
SHA-256: 11f5dc8370ae9c5aa6c2a0b0a61625474970564958d540955f3cfba610b5a6f1

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