Malicious PDF — malware analysis report

Static analysis result for SHA-256 1319255acf8a5a35…

MALICIOUS

PDF

96.2 KB Created: 2021-02-19 12:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 528f30b01d140517bb8c495745557248 SHA-1: 5751c40a76c118d6029694feae01490c46f611e5 SHA-256: 1319255acf8a5a35cf5d357446b3c0952e0225374c05a47a3bf4035a00aeb5bb
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a spearphishing attachment used to redirect users to 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://baarspo.ru/strik?utm_term=how+loud+is+a+honda+7000+generator PDF link annotation
    • https://cdn.sqhk.co/xarozowuzosa/HjjbhdT/mix_paint_with_water.pdfIn PDF document text
    • https://vuloninufe.weebly.com/uploads/1/3/4/0/134012437/615b2f.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/gciDhc5/zorulinizaxizexufe.pdfIn PDF document text
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/tagobe_muxomesiwafas_vajobo.pdfIn PDF document text
    • http://rotixumuzu.22web.org/guideline_af_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/4xjgqgd/neha_kakkar_new_song_2019_list_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/Ydijgf8/tajupuvigegijiged.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/5b31b0b040.pdfIn PDF document text
    • http://voztrans.ru/haas_machinists_cnc_reference_guide2dy0y.pdfIn PDF document text
    • http://mebets.xyz/7516895179843aev.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/igJicFa/fodijizamikodanifibise.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/523cfe7999065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizogebinide.rf.gd/c_arm_machine_full_form.pdfIn PDF document text
    • http://deketinak.rf.gd/40900359891.pdfIn PDF document text
    • http://kowotasube.epizy.com/41643302766.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_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 5364 bytes
SHA-256: c3a875228daa4a77bbe7b30b883fd258224e64c69690d89c932f19d80c4b73f5
font_01_sfnt_off00014b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B28 11948 bytes
SHA-256: d96814e514dca1fb54052e0f0560801565d9879f0195c3b65b9b5d59cb3b2f4e

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