Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a9c31e9c6fd282…

MALICIOUS

PDF

82.3 KB Created: 2021-03-02 14:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: af5186da22c40c15d10b335615290005 SHA-1: 5d5f47da56660e2a376025a56080accba67de28e SHA-256: 06a9c31e9c6fd2827e3fda63f42680ab013e56466b8bdcd2def9919c08616257
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=craftsman+mini+tiller+4+cycle+parts PDF link annotation
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/3205448.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/image_map_photoshop_2020.pdfIn PDF document text
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/5129876.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/799830.pdfIn PDF document text
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/rokeni.pdfIn PDF document text
    • http://danivufulof.iblogger.org/mevituseliledokiteriku.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/loxofarugobus.pdfIn PDF document text
    • http://martans.space/ham_radio_deluxe_software_download3ie3w.pdfIn PDF document text
    • http://mxbur.fun/hard_food_words_for_hangmanmvmrc.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/jigjdH4/40056697925.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/nrTzpja/maxitutugupej.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/eQgegcd/ketejikujediwiwopunitifu.pdfIn PDF document text
    • https://zokuxupan.weebly.com/uploads/1/3/1/4/131412362/forababa.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/aa052c2835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxogofirovudux.epizy.com/41558169111.pdfIn PDF document text
    • http://kotasogova.rf.gd/jowozatonubonovegiv.pdfIn PDF document text
    • http://mijekobafenado.rf.gd/importance_of_audience_analysis_in_communication.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_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 5256 bytes
SHA-256: 8be326e23306dbfc0eb533f9903ab5ca330f495f1afc7518338506fe003cdfb5
font_01_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 11404 bytes
SHA-256: c69b71ada2e7af85dc475ffd5d102f10d7be53175f40a7343527dce3f2b8a471

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