Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4c2697bd6f8096…

MALICIOUS

PDF

73.1 KB Created: 2021-03-27 17:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ed2e1c9ab2277c0a4681ac8af227e80d SHA-1: c2a069cfc60efe7b2ed88528a65ffdc09900280e SHA-256: ce4c2697bd6f8096e471cde2bed8fe4df075e4f4ad47459418cc9b70066aa56b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'quantitative aptitude formulas', which is likely a pretext to direct users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=quantitative+aptitude+formulas+and+tricks+shortcut+method+to+solve+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5ff0a454c84e0.pdfIn PDF document text
    • http://vofafagame.iblogger.org/gelifekumit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6039a74b4bea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_6008c2b687629.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/how_do_i_pay_my_dish_bill_by_phone.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/bow_tie_pattern.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/richard_branson_autobiography.pdfIn PDF document text
    • https://cdn.sqhk.co/rodosidebo/WiaKchi/top_5_brawlers_in_brawl_stars_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/gcjiUG6/70940445646.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/ihcRkrQ/axis_and_allies_global_map.pdfIn PDF document text
    • http://nazawate.iblogger.org/82187928901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotoputoxo.rf.gd/jibemevine.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/fubonidudizevifojubud.pdfIn PDF document text
    • http://wivoruremuwun.rf.gd/computer_graphics_lab_questions_and_answers.pdfIn PDF document text
    • http://webidiwotew.epizy.com/frazier_park_snow_report.pdfIn PDF document text
    • http://pakafadudu.epizy.com/todexibofozuv.pdfIn PDF document text
    • http://jetedobov.epizy.com/fufodewoxesawik.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/horus_heresy_books.pdfIn PDF document text
    • http://rovujanoro.epizy.com/godaverirutizatotapi.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/supply_chain_management_with_example_ppt.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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 5580 bytes
SHA-256: f73bffd955a55a2d2e78554b93e2c1d68a25a200f1568a946d6830f651d66519
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10672 bytes
SHA-256: de64922bdedf504c885263eef971888cce7e4e00fdc1526a27bb10ec016b8414

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