Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96a11a5d3037579…

MALICIOUS

PDF

66.7 KB Created: 2021-02-17 08:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 981be83ec96ee071355205308624f4d0 SHA-1: 3160942b928dd6e401f6f5639cba05ff808922e0 SHA-256: f96a11a5d3037579aa8cced9a3a349f6a702c6255263d83c17d4dda30f0e59cc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

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://bologen.ru/strik?utm_term=anet+a6+original+firmware+flashen PDF link annotation
    • https://fiketizi.weebly.com/uploads/1/3/5/3/135387405/zeluvikawekum.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/zhcgh0X/20538847354.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/f98c0.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/mimarupotaz-sidazivu-migibulobidut-bujufazagogi.pdfIn PDF document text
    • https://zofenegug.weebly.com/uploads/1/3/1/6/131636866/lizejifolabo.pdfIn PDF document text
    • http://1green.space/matrix_live_wallpaper_iphone_freem4vdi.pdfIn PDF document text
    • https://ginixagizelak.weebly.com/uploads/1/3/5/3/135349131/8445c5a04e7038.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/ddb686b1acc9.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/xavefevazujisog_jokimenisokeb_podeweragufe.pdfIn PDF document text
    • http://mmmuuuue.space/senokot_syrup_patient_information_leaflettgj3e.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/bizoxezaje-gagixelisaseko-biseraki.pdfIn PDF document text
    • http://karaulovlife.site/cairngorm_piste_mapmd8in.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/vososasoxumete/halloween_word_search_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/5346186948.pdfIn PDF document text
    • http://ruxemad.epizy.com/malaysia_immigration_questions_and_answers_for_tourist.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_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 5416 bytes
SHA-256: 763e19ed673d5ad6abd017da4066adc60ec2d5917dfe1a85ec13abca6ca59dee
font_01_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 10552 bytes
SHA-256: 880eb8e0e64d3720d5de774ae17e12b2dc9d777dddfbeca6731cfc566f91f63c

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