Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9753d8bd71c8ba1…

MALICIOUS

PDF

78.3 KB Created: 2021-02-09 22:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c8ed5b5cc63b0a3650c3b5aa0137e054 SHA-1: c18e90be8dd290ed9694b5ad15cf7c7cf7efd98d SHA-256: b9753d8bd71c8ba13a76a7f58c1b89bcf698753f8bfac39b59ede294bbba0ef6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous external URLs, including one pointing to 'bologen.ru', suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Bihar tet question paper pdf', a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/aws?utm_term=bihar+tet+question+paper+pdf PDF link annotation
    • http://freehookup.xyz/convert_ke_microsoft_worderozn.pdfIn PDF document text
    • http://topdouche.xyz/adharam_madhuram_song_pagalworldwgxt5.pdfIn PDF document text
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/6771972.pdfIn PDF document text
    • http://airet.space/guerras_napoleonicas_causas_y_consecuenciassmx3v.pdfIn PDF document text
    • http://mkuu.club/gopikotafekodoselugih8i7.pdfIn PDF document text
    • http://1gusevshop.space/zezubujiwukurg6b7.pdfIn PDF document text
    • http://xploitcrew.io/english_communication_skills_questio654yb.pdfIn PDF document text
    • http://alex-travel.moscow/22200267600v33lx.pdfIn PDF document text
    • http://mbfsopg.com/neil_degrasse_tyson_astrophysics_in_a_hurry_downloadluw0m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426677/normal_600406b1d0d29.pdfIn PDF document text
    • http://top-shop-store.website/33783227516oc9pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/divotaraguwinilufuguf.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/video_er_for_android_any_website.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/56332696812.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 5272 bytes
SHA-256: eced2b11b261c07d8100b1d6e93cafe87375d55f3d6089f428ee0a3fc807e96d
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 11684 bytes
SHA-256: fa0f968550e49c9e2931b1b14fb6ba4a87d8bf4fec0e8e0a83064eacd1ff33e3

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