Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53aaaddc881e348…

MALICIOUS

PDF

78.2 KB Created: 2021-05-06 14:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a2980eb8a68b7f036670ebe3fd334e1d SHA-1: c79db0c1af50e3b0b7051abf0be94ebcf82da77c SHA-256: d53aaaddc881e3482a690975bac1b192c78a3a7e149e47c5012cb299bf3a2f22
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure are consistent with a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=start+up+nation+liberty+books PDF link annotation
    • http://basumoxivor.sportsontheweb.net/lulokejenaliteli.pdfIn PDF document text
    • http://copyright-helps-team.com/vuzigajoruzitazozovokijaa1898.pdfIn PDF document text
    • https://guridawado.weebly.com/uploads/1/3/4/5/134578433/5434510.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/investment_banking_terms_and_definitions.pdfIn PDF document text
    • http://iuts.space/keeping_you_a_secret_summaryi1t8m.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/91234869236pov3m.pdfIn PDF document text
    • https://fejumarawa.weebly.com/uploads/1/3/4/6/134611790/98c42.pdfIn PDF document text
    • http://form-copyrightservices.com/website_evaluation_criteria_checklist3l8k0.pdfIn PDF document text
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/kupixojimo.pdfIn PDF document text
    • http://bejawutipage.mywebcommunity.org/sogurid.pdfIn PDF document text
    • https://wanuvimuz.weebly.com/uploads/1/3/4/4/134462356/jiravilulenusod_kedixasenelakaf_xebarejavir.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/ronepatifot_metenuve_jafuwabikurane.pdfIn PDF document text
    • http://givimemaregudum.sportsontheweb.net/gujuvoxuf.pdfIn PDF document text
    • http://complect-tech.ru/xazedoxadisuwoxidinigmqnrr.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/rubeme.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/8aaa886ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_69de71e5b34a4c02b8bcf9f7700ddef7.pdf?index=trueIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_b068102b9b19402383e634cc16272333.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_2b0a722c74644ffb8eaa1b6f4825bad8.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_e529cbf8ef614b1886a5e69d709daaf9.pdf?index=trueIn PDF document text
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_66acee27f76c4f77934dced71af666f7.pdf?index=trueIn 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_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 5224 bytes
SHA-256: 1c457e7e99104b9407233fab745424a9186666139611a611df9bb9357a26d060
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10980 bytes
SHA-256: 6cdfde90dfbdd50e111901876503d6baa2b6f89a44e6f34c7ce7279dea2fec04