Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7088799cbfc9c8d…

MALICIOUS

PDF

74.6 KB Created: 2021-02-05 06:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e1013a0e957ab0d0a1d406957666384a SHA-1: 6692afd141e658abc2a70b100c42dd1a56420849 SHA-256: c7088799cbfc9c8d686278f42e624ce399216aac1da9bb822a3d1dcad2cfc4fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'bologen.ru', suggests the document is part of a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wb?keyword=new%20mustang%20auto%20or%20manual PDF link annotation
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/665393.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/pjijdXp/pafixepe.pdfIn PDF document text
    • https://giwakatunu.weebly.com/uploads/1/3/1/4/131437107/fivuvibor.pdfIn PDF document text
    • http://jokidinavefo.22web.org/yuntum_full_movie_hd_720p.pdfIn PDF document text
    • https://cdn.sqhk.co/dulidara/P9Pdhaq/fairy_dress_up_games_2012.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/5a2dd4d8.pdfIn PDF document text
    • https://cdn.sqhk.co/vazodowadu/4KihheD/directv_channels_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/fazofasufiwu/jicJkgc/pay_express_toll.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/V2ghggf/game_run_sausage_run_mod_apk.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/rowubunak/mx10_android_tv_box_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/fikonijumujaxanimuxezej.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/cambridge_ielts_8_reading_test_3_answers.pdfIn PDF document text
    • http://kubuxakul.epizy.com/bye_bye_english_song.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/24304406109.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/15474561904.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/kakutemigonutusugukaxedu.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_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 5064 bytes
SHA-256: 93746901c4bf40b29be1df2f54130f701b0b80506a9585ec7bef2ac2d9c91f93
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10772 bytes
SHA-256: 9a8dc0a63165b9e7097c49ff2e8e801f6a6e7d2e746176237e15fc4fdf4018ab

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