Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbff9e973d6c5b7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-03 09:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34719810b4f3caacd27ab21bd83ecdeb SHA-1: 2eb9f4d92afd0d84df35f384199cc22a2ae9b868 SHA-256: 9cbff9e973d6c5b7955882b6f2cc8e01a51d7343f438d982d250d8303d70b13d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://jottigo.ru/strik?utm_term=how+much+is+a+medium+size+big+green+egg PDF link annotation
    • http://pawomodom.medianewsonline.com/wadefixizowovo.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/how_to_describe_the_moon_and_stars_came.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/what_are_biblical_character_traits.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fef343ea4cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_60301f662bffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_602e44c0970c5.pdfIn PDF document text
    • http://shop50off.info/giganurovor4kpev.pdfIn PDF document text
    • http://help-copyrighteamservice.com/demazepemosogujetugiumvuu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5ff1fb2425beb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvarijes.atwebpages.com/atlas_of_sustainable_development_goals_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/22237318155.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/73915465780.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/how_to_change_epson_8350_bulb.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/fsrh_guidelines_contraception.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_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 5564 bytes
SHA-256: f64fbe90a9edc06a8ae5c63756844233ad5c91eeedac5ff53b8cb326f18e4509
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 11016 bytes
SHA-256: 9c905e02671b5f310268276258731ae33440ddc29ea3262ba8e50ca934a0a2b4

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