Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb741397b40d5a07…

MALICIOUS

PDF

75.1 KB Created: 2021-03-11 07:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37da80c659a287dc3aa482ef26e95251 SHA-1: d940658d04a1c9ff7f31e5cbe53b33f3b0126d3d SHA-256: cb741397b40d5a07f003e6cc1ce927b850028040d71b8f85e6774b56739c6706
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=great+gatsby+movie+guide+questions+and+answers
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/5285d9ee49848d.pdf
    • https://cdn.sqhk.co/lakuziwi/ifjhjel/lord_of_heroes_ally_or_occupy.pdf
    • http://lnstagramverifiedsbadgesforms.com/buvifofigzyq9a.pdf
    • http://starkrobotics.org/8898556927715rxa.pdf
    • http://sberpodarok2020.online/what_is_a_normal_crp_blood_test_readingr82xr.pdf
    • http://edevletorg.com/letter_of_credit_sample_malaysia4jef0.pdf
    • https://cdn.sqhk.co/sebixodof/jg3vjhT/1290_super_duke_tank_pad.pdf
    • http://slimerecipe.org/is_ethene_polar_or_nonpolarm2dyh.pdf
    • http://govnosiakxws.online/can_cortisone_shot_affect_sleepx77na.pdf
    • https://ronukeva.weebly.com/uploads/1/3/5/3/135385202/da2c9dce0b.pdf
    • http://investorlands.ru/proper_business_letter_format_canadahoxvx.pdf
    • http://appletopshop.ru/134893070695uaua.pdf
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/9cf20f02c79b12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7055d06d-a599-4654-b654-b7388bd9a13a/php_code_for_website_design.pdf
    • https://uploads.strikinglycdn.com/files/63736bb3-1b52-4eee-a321-b07f71f0c2ee/frick_9_compressor_oil.pdf
    • https://uploads.strikinglycdn.com/files/e9c062bd-7d90-40d7-b862-7773c6f02710/zerenufevolenuwogagejamub.pdf
    • https://uploads.strikinglycdn.com/files/63881091-4b08-4da0-88ee-764e8d7f1ff2/newest_harvest_moon_game_2020.pdf
    • https://uploads.strikinglycdn.com/files/2c118f01-8c05-4366-b08e-04b946abff30/the_mysterious_benedict_society_book_1.pdf
    • https://uploads.strikinglycdn.com/files/5565f773-65d9-422b-99ec-732f53049e8b/11_day_diet_fat_loss_for_idiots.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_off0000e936.bin
ddf67c2d6fcc9ba69f745da12c5d432d0056a8473727610f4978adbfbe4e22a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 5664 bytes
font_01_sfnt_off0000fc7b.bin
c0801789d673f4111b0c40aaeebc520ccfb50e036dcc44e7931291733ae423c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 10148 bytes

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