Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5199eecf514213…

MALICIOUS

PDF

73.6 KB Created: 2021-02-28 23:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d8ab1a64f5525797c614721798b18ce SHA-1: a8096aa8664f78c7a2036b010f8364faf69b690f SHA-256: 4b5199eecf514213a744e12dc5127267b8a898e2a8ce302ebb420123c59fb48f
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 external URLs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely intended to trick users into clicking malicious links.

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://soxebez.ru/wix?keyword=cellular+respiration+pogil+answer+key PDF link annotation
    • http://lebizifijafaxim.medianewsonline.com/80461846438.pdfIn PDF document text
    • http://segwaywheelchair.ru/2783982762246sfw.pdfIn PDF document text
    • http://goossyy.online/87877312591552p3.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/b9iihde/mosiviropinafademumovawa.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/fjgicWz/goxafufinemixipas.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/HhvnEha/directv_support_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/IgHhajM/56750665638.pdfIn PDF document text
    • http://dapabikokewe.iblogger.org/barcode_generator_excel_2010_free.pdfIn PDF document text
    • http://basiditdcf.space/what_are_the_functions_of_a_security_guard334gm.pdfIn PDF document text
    • https://cdn.sqhk.co/gupikekarobo/cjfidP8/mens_haircuts_styles_short.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/0qhg7id/vista_golf_course_california.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/QOhaShb/wanakexuvemujagokilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nasewuji.epizy.com/kafidokalexikodakawi.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/41583987255.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/65949692361.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/43942505674.pdfIn PDF document text
    • http://kametazita.rf.gd/are_garmin_vivofit_jr_bands_interchangeable.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/8834194805.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_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 5152 bytes
SHA-256: c793b21e9eab0326dad0601aa69e95c03ecfde676b0fa6ac9f49ca58d3e16ddf
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 9948 bytes
SHA-256: 147810102c529198750f966862144cf2d4f392cc0e739b79a0cbbd3a3f738e9e

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