Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a54bc1e4a08482e…

MALICIOUS

PDF

107.8 KB Created: 2021-03-22 01:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c3207d6cc4b8ec25991c9f36fe71ab SHA-1: d6b20a20a95eb86f889d32c4b592313a1b4c40ff SHA-256: 9a54bc1e4a08482e2691decd67f7e8999f5ab2f8f38bcd69146ed6611d729196
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO manipulation tactic. The primary URL, https://vilenefex.ru/award?keyword=agglutination+reaction+in+immunology+pdf, is likely part of this scheme to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=agglutination+reaction+in+immunology+pdf
    • https://cdn.sqhk.co/zitedefew/nMGggia/kujabisovused.pdf
    • http://gatowixipeba.mywebcommunity.org/93084176032.pdf
    • http://siwupojotuj.getenjoyment.net/hotel_reservation_system_thesis.pdf
    • https://cdn.sqhk.co/remowiwa/9migjgG/alley_electronique_ball_blaster_game.pdf
    • https://cdn-cms.f-static.net/uploads/4368732/normal_6011f11a8b62c.pdf
    • https://cdn.sqhk.co/ribafesupuro/id1iiii/helix_halloween_super_jump_mod.pdf
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5fc61914cc927.pdf
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fc966b97d0f9.pdf
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fcefdcf37a19.pdf
    • https://cdn.sqhk.co/gatavazer/gLwZAjd/first_electric_motor_invented.pdf
    • http://tupaxeguna.scienceontheweb.net/25556137684.pdf
    • http://pefiworawodud.mypressonline.com/2602735936.pdf
    • https://cdn.sqhk.co/mugegiduveb/ZgfQg5U/large_sputnik_chandelier_gold.pdf
    • https://cdn.sqhk.co/zivuzigup/Qheqjhc/90203501116.pdf
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/niwotugo.pdf
    • http://wugupomovupa.sportsontheweb.net/71830166030.pdf
    • http://mevukavotidu.getenjoyment.net/66874767195.pdf
    • https://cdn.sqhk.co/salosegebomi/2cOMjiW/harvest_host_fl.pdf
    • https://nezokamovijemi.weebly.com/uploads/1/3/1/8/131856769/4691214.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xogijowag.onlinewebshop.net/mijumip.pdf
    • http://padusij.onlinewebshop.net/facebook_marketplace_categories_boats.pdf
    • http://jadivepijuga.myartsonline.com/solid_converter_to_word_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cf1.bin
63fb57eaca1849d58037f09d1b217edafbf1e22745e5ce1a5f07e292ec6f317d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF1 5268 bytes
font_01_sfnt_off00016eca.bin
5716a66f3c72286b74eae9ee45f6e6f0662972e43560e30ced0e44327c9d4f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECA 10468 bytes
font_02_sfnt_off00019286.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19286 4324 bytes

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