Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b57239262f5196…

MALICIOUS

PDF

92.0 KB Created: 2021-04-01 10:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 14bc9203c98ac275f73486b28672f87f SHA-1: d03c200ae617643fb38daef45eca31773e2033f9 SHA-256: d3b57239262f5196b5db65b98fb0c76a5cfeaf3aa7f95ca4485b6c1e3efd18b2
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the PDF structure itself is used to redirect users to potentially harmful external resources.

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://xezojetit.ru/award?keyword=cerium+oxide+properties+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6052815099508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_601610cc5284f.pdfIn PDF document text
    • http://banolapisa.iblogger.org/classic_halloween_movie_trivia_questions_and_answers.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/jenejovesoxixukobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391954/normal_5fddcc366fca8.pdfIn PDF document text
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/tavalanu_tenapiteto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_6050618692f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_60468189de9c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412382/normal_6001d830b2b40.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
    • https://uploads.strikinglycdn.com/files/d0213f39-86bd-47cd-961f-8adb955c0d7c/superhero_mods_gta_5_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e790de3-7995-4d6a-8bda-eb35b12de42c/posapovoriw.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/lupakemeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394c1b59-f47d-4095-821b-d11a2e4251b3/81946731950.pdfIn PDF document text
    • http://kopuperoki.epizy.com/crusaders_of_light_guide_shadow_knight.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/69830937782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88f9890-d2fb-4084-ad4d-0ad73aaaa73c/tone_poem_in_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/equifax_credit_report_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e608715-8593-46ee-9556-877eb5b85174/cvlife_scope_2.5-10x40.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 4812 bytes
SHA-256: bc175aa9a76c281875c15b9c69a443054674eeb9383fabb57bb32bd9ca3b2fa9
font_01_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 11904 bytes
SHA-256: 1850ad398e48e19b5b65674ba47630add93c59b7d43caefbd62dd99117d144e6
font_02_sfnt_off00013f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F85 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_03_sfnt_off000153ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153ED 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361