Malicious PDF — malware analysis report

Static analysis result for SHA-256 f533b19468a1b115…

MALICIOUS

PDF

80.1 KB Created: 2021-02-06 19:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ad101fe96936396d8017a3fa2c491e8e SHA-1: b44cb45f2128d09bc6e7e9b6fd41fd316bd9083c SHA-256: f533b19468a1b115da25842b024272082a8924125f12972306f86831a6b512a7
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=small+dent+puller+autozone PDF link annotation
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/4592308.pdfIn PDF document text
    • http://naturalm.space/conceptos_de_educacion_fisica_autoreh05em.pdfIn PDF document text
    • http://mrshadow.net/powerschool_mobile_app_code3k5mi.pdfIn PDF document text
    • http://lyudi23.ru/jump_jump_ball_2018_apkaifg6.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/deperu-loxijezirod-vuzatagovefovo-gurasuwu.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/nutazezikawafan.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/sobipojarofufefugi.pdfIn PDF document text
    • http://edaruzal.xyz/954449537324yr4e.pdfIn PDF document text
    • http://adanakebap.org/fosepirinalanagekulekio2hnm.pdfIn PDF document text
    • http://sodahq.pro/78251682339ismib.pdfIn PDF document text
    • http://itverys.space/917451917986ox5e.pdfIn PDF document text
    • http://optamorem.com/67351239959dtdst.pdfIn PDF document text
    • http://tiktokfrance.fun/xizodobigekudufidibguxk.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/7733280.pdfIn PDF document text
    • http://gazzsheff.xyz/bike_computer_your_personal_gps_cycling_trackerw0vu7.pdfIn PDF document text
    • http://edayafar.xyz/12631730733m4aaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowibimedex.rf.gd/accepted_2006_movie_free.pdfIn PDF document text
    • http://witosef.rf.gd/bitutokijizipaluja.pdfIn PDF document text
    • http://xasives.rf.gd/sirekenejetusof.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/vabopojigavewesomele.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_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 5080 bytes
SHA-256: a3602870996aad30fccfb4710461501cdaece7dc27b20d26afe086448924384f
font_01_sfnt_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 10744 bytes
SHA-256: b5cf8195757efb22762423dd05bf785d09abfa0a0f1555b98bf93c9a7ce304ee

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