Malicious PDF — malware analysis report

Static analysis result for SHA-256 996d8c98b5af40f5…

MALICIOUS

PDF

82.0 KB Created: 2021-03-20 17:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7445e9c71f36a53197e210c34e4ef3cd SHA-1: d0623e99d0e2c303ce2be8b8eb0090934ad9dd4e SHA-256: 996d8c98b5af40f56f964667ed4ca62834b71c7e9fae450181792dc70dbed2d2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to SEO-optimized PDF hosting sites, suggesting a link farm or content-spinning operation. The primary malicious URL identified is 'https://pelibifir.ru/aws?utm_term=diablo+3+necromancer+build+non+season', which is presented as a lure for Diablo 3 build information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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://pelibifir.ru/aws?utm_term=diablo+3+necromancer+build+non+season
    • https://cdn.sqhk.co/sixitigoxeto/V5Wgjhh/tevezo.pdf
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/4174975.pdf
    • http://zatutajijiti.getenjoyment.net/arduino_web_ide_esp8266.pdf
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/d9d30fcbf40cb02.pdf
    • https://foroziroxodom.weebly.com/uploads/1/3/4/6/134647192/kifazomawigiduva.pdf
    • https://cdn.sqhk.co/rosomugimo/jfiaiej/yellow_wallpaper_theme.pdf
    • https://cdn.sqhk.co/dasofuduveje/LBBhbhc/24786388645.pdf
    • https://cdn.sqhk.co/lorotukogof/eoosfiI/double_dragon_trilogy_free_download_for_android.pdf
    • https://sigukelerodon.weebly.com/uploads/1/3/4/4/134491686/zakitiru.pdf
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/gisubeva-sumamazefak-fajip.pdf
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/202470.pdf
    • https://xowavexinoj.weebly.com/uploads/1/3/1/4/131408618/wuladu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8c3b207e-460e-4038-b961-42d257786f77/28147766676.pdf
    • https://uploads.strikinglycdn.com/files/7a1eb1f5-5d7a-48cd-8d5d-b656ce0d449c/2854358859.pdf
    • https://uploads.strikinglycdn.com/files/a8be94d0-3f0b-4024-802b-184711c724a5/what_color_do_dachshunds_come_in.pdf
    • http://kexomun.myartsonline.com/ethical_considerations_when_conducting_research.pdf
    • http://lugivodunoxasi.atwebpages.com/33694465746.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_off0000f2bf.bin
da310658fa4012a520f1793194d02ffd13b7ef64c0c9d984ec71d9ba9315ef88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 5188 bytes
font_01_sfnt_off0001042e.bin
ea414dac6361dec431cadf146400cd72867f30e126d126abd37b7b510a62e5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 11436 bytes
font_02_sfnt_off00012b05.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 4324 bytes

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