Malicious PDF — malware analysis report

Static analysis result for SHA-256 32542c518c44f25a…

MALICIOUS

PDF

81.1 KB Created: 2021-04-06 13:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eac3e283342060c08b0af19fad6bd73c SHA-1: 8b8976076292e04ba2611acea97f711a4a8dec90 SHA-256: 32542c518c44f25ac6452ae68bd27dde4fd66471ddeabce32d18b100188429f8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

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://pelibifir.ru/strik?utm_term=genealogy+of+morals+pdf PDF link annotation
    • https://cdn.sqhk.co/nikajovefer/hwT9gef/knife_hit_toyz_knife_hit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6052e8bce97db.pdfIn PDF document text
    • https://cdn.sqhk.co/notokulojow/jhCjbje/miranda_lambert_instagram_hashtag.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/vEjj0jg/giterojufukapuki.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/4b6d5ff2219.pdfIn PDF document text
    • http://zoomita.fun/82550420482p26l8.pdfIn PDF document text
    • https://cdn.sqhk.co/fixikumeboga/iiigyib/monkey_bread_with_biscuits_in_crock_pot.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/vijivasodizisigifib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_6067f5471ac47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_604a8e3082bba.pdfIn PDF document text
    • https://tibuvaji.weebly.com/uploads/1/3/4/7/134720571/wazumuzawidaki-penodoboto-kawujirovenom.pdfIn PDF document text
    • http://lelofewadu.iblogger.org/castle_of_otranto_character_analysis.pdfIn PDF document text
    • http://svoytrylend.xyz/42844292334svwku.pdfIn PDF document text
    • http://vovodofozufora.iblogger.org/doseraxojimubanudoverene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_606b87a7cf0ed.pdfIn PDF document text
    • http://jepowoxudo.iblogger.org/aviation_weather_abbreviations.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/712ae159-c70a-4e39-9b35-10ff80cf73f6/yamaha_moxf8_manual_espaol.pdfIn PDF document text
    • http://fisowafoz.epizy.com/27486934117.pdfIn PDF document text
    • http://bemajisuvu.epizy.com/computer_backpack_mens_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52fc101-5631-4038-aef0-0ff523cf194a/6541745634.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_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 5496 bytes
SHA-256: 32d7078510f173dcedaebaa931df87c051a2ee48fa204f8b388b933c525cf520
font_01_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 10416 bytes
SHA-256: c17b0301d84252eb3b4d18eb0408d5ce699941e3c4ba09927fe2fc9ff3358018