Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74abbefcce0672e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-01 09:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 044a731d4b3d92d9ab43d9d8df7a3c5b SHA-1: b16efb82534b812f6de995c35c7b517f9246a121 SHA-256: e74abbefcce0672e825db4ae8b4890615884d0e540ed79430167886ff7775127
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable or suspicious domains, indicating a link farm designed to redirect users. The primary link identified, 'https://yafferge.ru/award?keyword=how+to+start+lexus+with+dead+key+battery', suggests a lure related to car maintenance, likely to phish for information or distribute further malware. The ClamAV detection and ML classifier strongly 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=how+to+start+lexus+with+dead+key+battery In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_603608f53d8a5.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/CUhghh7/32345542996.pdfIn PDF document text
    • http://7lessons.fun/browser_video_er_onlineo1gw9.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/22c5e7e28.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/7088985007.pdfIn PDF document text
    • http://discout.online/sivaji_the_boss_telugu_movie_mp3_songs_downloadx3szr.pdfIn PDF document text
    • https://dosukasexu.weebly.com/uploads/1/3/1/6/131637789/1004934.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/dihhjif/lego_star_wars_death_star_gunner.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/622fca0fc.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/9uZsjeK/cara_memakai_personal_sticker_for_whatsapp.pdfIn PDF document text
    • http://virnet77.ru/jiratonupw3zkp.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/lAUeieG/pixel_3_launcher_apk_for_samsung.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/understanding_food_principles_and_preparation_6th_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/hjfdgcs/jotad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/99867621267.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/how_to_build_your_own_vocabulary.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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 5340 bytes
SHA-256: 1288260b3ce6f67e48d243834300fde3cdec3ac970fdd70e8f2b84e90cf56c74
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10672 bytes
SHA-256: 2f33e98685b52e46a1cec1b76a871e69a35a362f589f17e1af0374a74a0fc344

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