Malicious PDF — malware analysis report

Static analysis result for SHA-256 416067939381f85c…

MALICIOUS

PDF

77.8 KB Created: 2021-04-08 11:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1f4c4fed5f95c931f66aa95c17fc318 SHA-1: 19210ddeb125dabf3368d809b185925720966ae3 SHA-256: 416067939381f85c856aec92b53f2e76954885cfba58f0cf288e605f14c37b6b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=is+gta+5+going+to+be+on+ps5 PDF link annotation
    • https://ramazupefedaze.weebly.com/uploads/1/3/5/3/135336263/mizidevegokim.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/pitimupem.pdfIn PDF document text
    • https://tateleref.weebly.com/uploads/1/3/5/3/135322569/68be38f6b78b.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/gBRjggp/44991722358.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/9839545.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/bidub.pdfIn PDF document text
    • https://cdn.sqhk.co/lemijexo/giGphaU/jokores.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/kzsfgdc/87045406477.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/8tia9pV/spiral_balloon_arch_prices.pdfIn PDF document text
    • https://zasubimivari.weebly.com/uploads/1/3/1/3/131383839/vofivumufuzup_ropenifatigux_ranafowos.pdfIn PDF document text
    • https://zenalebib.weebly.com/uploads/1/3/5/9/135966912/rukelivofu-tomuk.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/061f87b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/accident_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/rumejuvojefuni.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/dezutazenuvaj.pdfIn PDF document text
    • http://sipaduterofa.rf.gd/makkar_ielts_speaking_may_to_aug_2020_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/tissot_pr_100_chrono_alarm_manual.pdfIn PDF document text
    • http://bugavujozi.epizy.com/alter_ego_3_manuel.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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 5060 bytes
SHA-256: 915654bbaa9cdc98aa452eed4a4252ad7c6f12caebd5ce44507b6525af6f1e29
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10580 bytes
SHA-256: b72c739b084125c52fdb7fbf148448a46ca308a8cdb7c7276fc69f2c1ea6fd73

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