Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c98c993a0f720f0…

MALICIOUS

PDF

75.0 KB Created: 2021-05-05 16:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7de7e776252e68732eeb830d136b1c17 SHA-1: e787aaca47583a6e9cb7272811a5d84cb65cc09b SHA-256: 1c98c993a0f720f0df2e12252c4164e3726296413c8cd2091c874d6ef7106a2e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though partially corrupted, references 'how to prove parental alienation in court', a common lure for phishing or scam operations.

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://druttle.ru/strik?utm_term=how+to+prove+parental+alienation+in+court PDF link annotation
    • https://rovinimowi.weebly.com/uploads/1/3/4/6/134682499/16e453.pdfIn PDF document text
    • http://graatorama.fun/92389839679myabq.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/2963775.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/tavelabiruwizuv-limenipe.pdfIn PDF document text
    • http://edapog.online/64915823495h8b95.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/Wjd6JSh/covid_alert_nj_reviews.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/70699501275ylgua.pdfIn PDF document text
    • https://mafizawejibon.weebly.com/uploads/1/3/1/3/131383772/360135.pdfIn PDF document text
    • http://ig-support-service.com/what_is_the_generic_structure_of_report_text_adalahx9vta.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/aMijAgf/52435268728.pdfIn PDF document text
    • https://monirazosakazux.weebly.com/uploads/1/3/5/3/135316997/8a0bb44aa.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/f06dcd22-60cb-4b9f-8349-34d93908c114/gunerarupane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efd653d-9216-4286-86a6-814cea241426/the_power_of_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73b4271-57ce-445d-ad83-54e174f8b2d1/xofuponoravebatevi.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/94526358504.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/18362157113.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/kuvoligusetaloz.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_559d71d37ff54fc7900ebc4e1e86d62c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ee5609-8f84-4fbf-bc64-7b931b97fe1b/entry_level_mechanical_engineering_jobs_in_austin_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/jpegs_opening_in_paint.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_9528c5a9b6364ca7a45cc58173f72c9b.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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 4860 bytes
SHA-256: a88574438b2666a863f0bd3a32fe82ae0df55d168d5cd501e46dc32830194934
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 10740 bytes
SHA-256: 9a3bf348e8d964cae474ad3b99102f67e41ba9c993374cf90efff02a96d08b0b