Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa681d339a714ee0…

MALICIOUS

PDF

77.2 KB Created: 2021-03-06 10:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e0a35120da8d7e59d7dc1c2b618a7fb9 SHA-1: ec32b4729b09fb9edb43b6360bba5f372c13bd98 SHA-256: aa681d339a714ee057b8c323e0f3dba1791380faef4903212c4c298c918a2000
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying the suspicious structure. While no scripts were extracted, the embedded URLs and heuristic firings suggest the document's purpose is to redirect users to potentially malicious sites.

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://nipisod.ru/strik?utm_term=is+bob+evans+sausage+gravy+keto PDF link annotation
    • https://cdn.sqhk.co/zuxeromewime/bieLje2/small_wood_cutting_boards_with_handle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60148f1b5ceda.pdfIn PDF document text
    • http://nickned.me/after_effect_template_photo_slideshow7ibhl.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/jakaluwekevop_gubomejapijebe_jujajaguzebet_jalip.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/gfRgIFH/100_doors_horror_level_16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_603164a6e0ac4.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/7969613.pdfIn PDF document text
    • http://pomirkapa.site/19088968560zcyux.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/4K0pici/35314345849.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/985040de2fdb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_601dd64e3cce4.pdfIn PDF document text
    • https://vezejajanobel.weebly.com/uploads/1/3/1/6/131606482/9651519.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/ggBhd84/worst_game_ever_in_roblox.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/libusamagowuvo/kubuwijagidukalenef.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/39628929159.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_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 5124 bytes
SHA-256: a5dfe5bbe83fc438079f485cc7aa435e978698e56db9424cdf5e9792367688ac
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10352 bytes
SHA-256: 35a2131fd7cc00bbb6ff5ab1714d2e297baad0520871e5f38e7cfeafad9e7871

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