Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0203a02ee2e26f…

MALICIOUS

PDF

67.6 KB Created: 2020-12-14 01:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 655eca68741397183e81a9c15b8ce774 SHA-1: 5e33c68e6e1a0f12142d8a1155ce0d65f6c4f5c7 SHA-256: fd0203a02ee2e26fe00fa7ee886a0c2adc1e095a2e32efd7935a6041ce02d65f
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a domain associated with phishing lures ('sample letter to landlord for repairs california'). The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted from this sample, but the presence of numerous external links suggests a focus on redirecting the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/123?utm_term=sample+letter+to+landlord+for+repairs+california
    • https://cdn-cms.f-static.net/uploads/4501041/normal_5faeb867da773.pdf
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/kudar_vomenupep_widanas.pdf
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/e7d61.pdf
    • https://nurixuwabojud.weebly.com/uploads/1/3/4/5/134587723/goxesus.pdf
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/zotabukapezo.pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8ee17d2d6f1.pdf
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/zuxozit.pdf
    • https://jegesasep.weebly.com/uploads/1/3/4/5/134502647/946425.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kuxuxemu/nifaromewofegadutimuvufi.pdf
    • https://s3.amazonaws.com/tadovu/dapexalazovide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc6.bin
a5963d0bc02427457f750e6ab38f8214f49fb1d8379c5aefe464c4dafb174833
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 5404 bytes
font_01_sfnt_off0000de0d.bin
b96bfeadb9f10588ad1c1de5a6874f5073ba9d49eed2d6335f1906ad74deeece
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10388 bytes