Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba86d51aef64b33…

MALICIOUS

PDF

83.2 KB Created: 2021-06-04 09:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b052d5367e64528f13db05bdaa0405d6 SHA-1: 2486a5a19cf7844aad1642c1bc3f6ea014232d06 SHA-256: aba86d51aef64b333713bc2022fde212fdca4b4b2508bc71ffe6fa8cdb24b37d
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, many pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/pbw?utm_term=how+much+does+a+mercury+9.8+weight PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447093/normal_60445cff42b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_605913b8318cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_6061f6cea4711.pdfIn PDF document text
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/fobetapin.pdfIn PDF document text
    • https://ganunuzarije.weebly.com/uploads/1/3/4/5/134518475/xotivogi.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/80f45e62c84147b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_6001df247c42e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93d5d10-50da-4463-84c6-c5d5f34799f6/nufowu.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/ipcc_standards_on_auditing_short_notes.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/duxenufojuv.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/how_to_upload_ignou_assignment_2020_online.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144478629/58608946019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8438e5a9-d42c-43a3-9bf8-4f6d3764e4b9/bancolombia_sucursal_virtual_personas.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144575319/chapter_3_quiz_2_geometry_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e376a41-38f3-4124-8e36-aa514ecd3e25/xelolimival.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144449046/how_to_see_torn_acl_on_mri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c7042b-a144-4c1a-af58-0cfbbc260b52/best_sensitivity_for_pubg_mobile_lite_no_gyro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acca45e7-1c4e-41fa-b6ec-6c7b409e7d8f/77711041640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf6c3fa-db60-44c5-88a3-5b6e657821f1/lilozefaxujasuz.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/bewesariwibolawuvilijima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf71e56-8953-4351-9f71-8dfee76f8889/41469037817.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144547899/other_words_for_master_of_ceremonies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a7ae57-d275-4325-90f7-e307537fc897/98_polaris_xplorer_400_carb_settings.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144427683/goblin_cap_1_espaol_latino_descargar.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_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 5856 bytes
SHA-256: 6fdb2cda62aa551c3151445ca8c4b9577c02d75d982f27e6805d631ba35789ee
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 11216 bytes
SHA-256: cedfc837b198c9e73a57da3fe576ed05fd8b3d8e5cb7e9187d911ab51cacc10a