Malicious PDF — malware analysis report

Static analysis result for SHA-256 0526ead4fe031dfe…

MALICIOUS

PDF

75.9 KB Created: 2021-05-29 23:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f832ffbd8e84563236ee6eefdf4c29a SHA-1: e4ec21fefa5a805778def7ec1322d351bc2a0859 SHA-256: 0526ead4fe031dfef54d0591b76108672598bc9260e80507bbcb64ec0d4461c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to academic records, which is then linked to a suspicious URL for further action.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=procedure+for+duplicate+marksheet+mumbai+university
    • https://cdn-cms.f-static.net/uploads/4386591/normal_601f9c70e541e.pdf
    • https://xolixofebus.weebly.com/uploads/1/3/4/5/134502144/6422553.pdf
    • https://gibinebixupiv.weebly.com/uploads/1/3/1/3/131379057/wojixiderenalom.pdf
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/gafazinewokovekumime.pdf
    • https://bazulezegit.weebly.com/uploads/1/3/4/3/134372971/5820054.pdf
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/gufevaverevufe.pdf
    • https://tofojuduvebexaj.weebly.com/uploads/1/3/4/6/134650498/wavas.pdf
    • https://cdn-cms.f-static.net/uploads/4375909/normal_606e65f918cef.pdf
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/e01d48.pdf
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/xumorekozit.pdf
    • https://fobijolosa.weebly.com/uploads/1/3/4/7/134730704/tugatexu.pdf
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/6856587.pdf
    • https://zosafuwevuki.weebly.com/uploads/1/3/4/5/134524468/14c1b10.pdf
    • https://nenafusorez.weebly.com/uploads/1/3/1/4/131453248/2794528.pdf
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5fe2e1048f492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/06a45b3e-7df7-43a5-9003-3376d92c19fc/robert_collier_obituary_montezuma_ga.pdf
    • https://uploads.strikinglycdn.com/files/3e16e9b3-4bd9-43ab-90b2-ea10a177ce05/download_game_dragon_ball_z_budokai_tenkaichi_tag_team_for_android.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_off0000e92c.bin
ee175ebf0224397ad296a9d641c4d71c693425365f670f83f938dcf065babb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 5764 bytes
font_01_sfnt_off0000fca3.bin
783f25ec0c24f0a0f18ce98be709b6d1f2e92802ba744dbdb4ae82f6e9cb1f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 10936 bytes

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