Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb890206df99e9dc…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 01:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7d8120c998d026e4d9ec6c19b153102f SHA-1: babf2dc2f2124f6d15ff7def05c71f9b6380d2de SHA-256: cb890206df99e9dc7e8fd9c3cf868c908b77404461a9302a609673924acbbe19
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

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://soxebez.ru/wix?keyword=dmx+operator+manual PDF link annotation
    • http://dipenoguzel.sportsontheweb.net/forrest_fenn_treasure_finder_lawsuit.pdfIn PDF document text
    • http://7gusevshop.website/27262669965g59lr.pdfIn PDF document text
    • http://jushq.pro/zusonoredulfsecr.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/11081919337.pdfIn PDF document text
    • http://zipimenegan.iblogger.org/23940800672.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/risupujev.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/how_to_lose_weight_eating_3000_calories_a_day.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/fantastic_beasts_and_where_to_find_them_3_2022.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/how_to_get_a_private_investigator_license_in_south_carolina.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/fasudikek/60553588502.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/69552064034.pdfIn PDF document text
    • http://bepizokebador.epizy.com/14315880042.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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 4856 bytes
SHA-256: ee1b91200ec2c22f3a0faecff1e44665d97d7c58824fbcb79b1d8e6b79859b64
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 10488 bytes
SHA-256: b26f183b476dfca6d1f68ceda36f469dfb380ff5c00e4fef7d6e7eedbd2343cc

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