Malicious PDF — malware analysis report

Static analysis result for SHA-256 0638fb6504d76802…

MALICIOUS

PDF

93.5 KB Created: 2021-03-15 16:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcbfbede724f89fb59fdeaf9c1a8d296 SHA-1: 38ddf23598385fa4a1b62e5af1a77a3b30dbc868 SHA-256: 0638fb6504d768020475cb6e6c001f7ea1262984cadc88a15a7fbe0071252294
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. One prominent URL, 'https://vilenefex.ru/wix?keyword=interview+with+a+vampire+pdf', suggests a lure to attract users searching for specific content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=interview+with+a+vampire+pdf
    • http://ukrinsure.com/dimuzititozuwap4x6xh.pdf
    • https://cdn-cms.f-static.net/uploads/4450501/normal_600b5e4301463.pdf
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff598757fe6b.pdf
    • http://nefritthebestthing.site/mizapetatezosokipawowl2vml.pdf
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/duwokopuxowow.pdf
    • http://palitra-cveta.ru/27386436642y8dmf.pdf
    • https://cdn-cms.f-static.net/uploads/4495265/normal_601741a61c814.pdf
    • https://cdn-cms.f-static.net/uploads/4408875/normal_6017039fa4f25.pdf
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/62158e4368d689.pdf
    • https://zabagogaj.weebly.com/uploads/1/3/5/3/135313674/wadinopubojalo_napadede.pdf
    • http://ch-data-2a8fv9s.pw/76051910030s4bin.pdf
    • http://curvepreloved.com/47454751675oqohe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75711d06-db0e-4435-bd45-1d5dffebf673/46190787725.pdf
    • https://uploads.strikinglycdn.com/files/32258eef-0f93-4689-b979-0248aee696a0/warhammer_fantasy_rpg_3rd_edition.pdf
    • https://s3.amazonaws.com/bipepezuwed/fifezutejalin.pdf
    • https://uploads.strikinglycdn.com/files/6ecbbb09-ad89-4246-b38e-13ebb70b717b/final_fantasy_xv_ps4_pro_vs_xbox_one_x.pdf
    • https://s3.amazonaws.com/nijudow/crazy_frog_dance_mp4.pdf
    • http://kojexeruxub.epizy.com/29724987236.pdf
    • http://mepudizik.rf.gd/campbell_biology_10th_edition_online_textbook.pdf
    • https://uploads.strikinglycdn.com/files/adb621c3-93a5-4a15-b25c-8d7c4871655c/88616077629.pdf
    • https://uploads.strikinglycdn.com/files/3ba50db2-baa1-445a-9d28-cb9246defc82/sifapobesobazi.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_off00012ee8.bin
b5a6a6a1bf57e30afcc220732e16e9cde5546b4e72d36db15cd909b1b809f8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 5160 bytes
font_01_sfnt_off00014063.bin
f9ab2c7ed7cc8982b3756964cd591d57d47485377f15f608ba1c7a875fa9b178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14063 12516 bytes

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