Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2bfbd1250c7183…

MALICIOUS

PDF

81.8 KB Created: 2021-05-12 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 215f07371776c8211c1cb7aa1f892d0b SHA-1: 3de0ad1da8b442ea73a3435455d7613e524d526d SHA-256: 7c2bfbd1250c7183198bf9f4d609548129cc9298df36cea8ab429b609569c41c
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 lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=como+paso+mililitros+a+gramos PDF link annotation
    • http://sotipidikukunow.getenjoyment.net/accelerator_theory_of_investment_in_macroeconomics.pdfIn PDF document text
    • https://zobilajes.weebly.com/uploads/1/3/2/6/132682335/tuzob.pdfIn PDF document text
    • https://rubebukani.weebly.com/uploads/1/3/0/7/130740450/wezixinoxow.pdfIn PDF document text
    • http://mugedly.xyz/popadudismu5vh.pdfIn PDF document text
    • https://fixexetakofipu.weebly.com/uploads/1/3/3/9/133997797/6175003.pdfIn PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/6bfeb9.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/gta_san_andreas_cheats_pc_full_list.pdfIn PDF document text
    • http://help-violation.com/koxuwifuwapen9qs72.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/16718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_d6960a50f39b4afabfa584b6177a8c55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d18908-bd6f-4c77-b50d-b720fc3b7f3b/apollo_twin_mkii_vs_apollo_twin_x.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_2b3f9b8007ca465fb5c715367d0fda19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/division_algorithm_for_polynomials_with_real_coefficients.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/40762583904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44bbe6a1-1d8c-498e-868c-7842b340040d/pulumegolaw.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_01f9c3584b4e4e9f8a17b6becede762b.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_ae604fea5f464a47a31284c7a9f1b798.pdf?index=trueIn PDF document text
    • https://adea4596-07c4-4c45-ba97-107779ed6dc5.filesusr.com/ugd/5bd9e2_ad0aa7166a59463ab3cb30c7f55eab1a.pdf?index=trueIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/xakavivigijuzop.pdfIn PDF document text
    • http://litorow.myartsonline.com/5552497982.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/base_de_datos_sql_server.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/rafepapavejomotizusefedu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 4724 bytes
SHA-256: 586248de152dd3157b5af8953e81bec22d9eb9c6c22bd8f120554188b0513877
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 12216 bytes
SHA-256: 5e234b1e7d64456f684c2c2dca9cb1581f50408e6cb057ef9c18233f6f28a4be
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e