Malicious PDF — malware analysis report

Static analysis result for SHA-256 93df9ff28a6eded3…

MALICIOUS

PDF

82.6 KB Created: 2021-04-22 04:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dca6d7822ae1cd72d3c0c8456629774d SHA-1: cc78feaff05c2ce6612004b1b1a5a813bfb1d096 SHA-256: 93df9ff28a6eded3eb032363dab882d30f8083c55d77646c3d818eb380c976d2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=iatf+16949+standard+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/puzadowoke/div6yIh/siege_world_war_2_mod_apk_latest_version.pdfIn PDF document text
    • https://zezazerin.weebly.com/uploads/1/3/1/8/131856191/0cb71d49e22da5.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/cgjC9W5/63905750904.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/hRhhedY/top_voice_assistant_apps_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/RVnAghz/91308651381.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/ghiijhc/melajasagibozarufago.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/devofito.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hijb4QD/93223411390.pdfIn PDF document text
    • https://bexulijariva.weebly.com/uploads/1/3/4/8/134885506/2602937.pdfIn PDF document text
    • https://ruritavi.weebly.com/uploads/1/3/3/9/133988031/c357066.pdfIn PDF document text
    • http://gejikojaki.scienceontheweb.net/7340844884.pdfIn PDF document text
    • https://cdn.sqhk.co/faxinomitux/4ieqbhh/ultimate_fishing_simulator_2_vr.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/hewha4B/34010348475.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/dsgd2jd/36864363561.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/jdhbsgi/7367934800.pdfIn PDF document text
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/299478.pdfIn PDF document text
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/pedexet.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/icgghau/70708714486.pdfIn PDF document text
    • https://cdn.sqhk.co/tazurusubiz/hcBjgRM/my_first_book_of_tagalog_words.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/definition_of_document_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nujilexulajuwup.atwebpages.com/gosumavuxixokedaked.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/39497987054.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/siponowuvo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 5180 bytes
SHA-256: b7ce9eab73fec6460905d7c8655783027bc895282985b1f521139ccab0a46743
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 11020 bytes
SHA-256: 567ffb7c3e1b4e5e35c56259102d10f6eed3f1627bbe2bdb56122b5dac60f613
font_02_sfnt_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c