Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee70869dcf8d4e9e…

MALICIOUS

PDF

66.7 KB Created: 2021-04-05 07:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 40d9b6aed4092a530adcf1de6ff5d53d SHA-1: 2b5174cd230615c581078f555ab18f0ec79eb136 SHA-256: ee70869dcf8d4e9e1f558b62e518204dae0e10e9a9a3bb61581c4fac2963b3ba
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK, indicating it is part of a link farm designed to redirect users. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=quadrafire+santa+fe+insert, which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/strik?utm_term=quadrafire+santa+fe+insert PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366305/normal_5fcecc1b44542.pdfIn PDF document text
    • https://cdn.sqhk.co/zitibidino/jgifc0C/monkey_banana_song_like_baby_shark.pdfIn PDF document text
    • http://montana-media.com/23642447029njvvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_604fdfad376c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_60243aa3bbea4.pdfIn PDF document text
    • http://world-wild-shop.com/58989358874ndz93.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/0hfXjgN/car_driving_school_simulator_2016.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/mipizaju/mismatched_meanings_american_popular_music_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/bifoger.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/functionalism_media_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/shark_vac_then_steam_manual.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_b19ca22228dd4639b954053940c80ad4.pdf?index=trueIn PDF document text
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_8539b1470e224006af6bea853f96c01c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/limesurvey_survey_templates.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_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 4928 bytes
SHA-256: 10febdca986a8f611245761009ced4be0451e21f04f943d9ff24d893b235225b
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10692 bytes
SHA-256: 80748d5dffcebee6b9eaa62eb6d750eed9714d3d1f106c457bf4fcff073ef899

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