Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ed6831fddf84f4…

MALICIOUS

PDF

71.4 KB Created: 2020-11-10 11:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: adca997a35d1a94def66eee9aa5d4be4 SHA-1: 20c9f8c339551293804a19686b326c59f545ab6a SHA-256: 06ed6831fddf84f49632c6d8f3070f01c42e5911d7557b6d5796d2042378ea56
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to 'worksheet answers', indicating a lure to trick users into visiting potentially malicious or spammy websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/strik?keyword=yellowstone+food+web+worksheet+answers PDF link annotation
    • https://ganubosi.weebly.com/uploads/1/3/4/5/134506756/ninodikotuju.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/095ae7d5e70.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/13cf37ad5874.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/sexomazivatujetos.pdfIn PDF document text
    • https://pofumojonoro.weebly.com/uploads/1/3/4/4/134474045/8132016.pdfIn PDF document text
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/c55b7.pdfIn PDF document text
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/lakitef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1ffbc6-f5e0-4acd-91ee-ff70e4f9b577/football_manager_2017_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eadd28f-8bd7-40dc-b0a5-0569fba965d5/67868057711.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/dinemogetapodolelanu.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/oxford_dictionary_english_to_english_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361f6e6b-b46b-4d6c-9777-eb2fb1818ae7/the_gulf_stream_painting_interpretation.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/pyramidal_horn_antenna.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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 5252 bytes
SHA-256: 1c43cce8b0e7e3f689b707b4694e80121e2cadf40d10ca21b1473f9ac2dc4e80
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10396 bytes
SHA-256: 4b0b49ec1423bf8cc810fd63f8d6aa39ae849513643657a68e236f9947b40141

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