Malicious PDF — malware analysis report

Static analysis result for SHA-256 2896f11aae39e98a…

MALICIOUS

PDF

85.2 KB Created: 2021-03-24 00:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbfccffae03027d3c6fcd5fcb5246e42 SHA-1: 55fe169844c1038d8dcbfe5508b1246271e99c2b SHA-256: 2896f11aae39e98a7f7c4b60039e10a05cc5a58a23033ede042024dbab1c89da
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm used for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of 'powershell_instead_of_cmd.pdf' in the heuristics suggests potential execution of commands, possibly to download and run further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/123?utm_term=data+analytics+platform
    • https://cdn.sqhk.co/toromerepowa/CeRqEid/27311361691.pdf
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/sanidetatonimo.pdf
    • https://cdn.sqhk.co/gizoxemovefi/FA046ig/lego_super_mario_nintendo_entertainment_system_tm.pdf
    • http://trydouche.xyz/dasawajotijipenanaj9mrfa.pdf
    • https://fazizutedo.weebly.com/uploads/1/3/4/7/134768054/xazeki.pdf
    • http://cashfree.store/what_is_megan_from_fox_news_doing_nowjziqk.pdf
    • http://smm-target.ru/what_are_the_critical_questions_in_nmc_cbt4snc6.pdf
    • https://cdn.sqhk.co/vapatibu/Atj7hcp/marketplace_nyc_facebook.pdf
    • https://cdn.sqhk.co/nawamuzimosu/jcJ9Yhb/neratogogidi.pdf
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/2118033.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_a21caa18d50a4ed2beaa656ff89e2d25.pdf?index=true
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_803e7f6f08b14e1e8ed148fdae7e0766.pdf?index=true
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_2307c499aeef4b9fa4cd5934d93d9be9.pdf?index=true
    • https://s3.amazonaws.com/jeworurowam/30390392315.pdf
    • https://s3.amazonaws.com/taguxif/batch_file_programming_virus.pdf
    • https://s3.amazonaws.com/jadudusujuje/can_i_use_powershell_instead_of_cmd.pdf
    • https://s3.amazonaws.com/boxalewijim/meiosis_worksheet_biology_corner_key.pdf
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_a216bac49de849fe82c318489011483d.pdf?index=true
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_f655ae5f263b4d38a31a92e60ce1b35e.pdf?index=true
    • 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/
    • https://s3.amazonaws.com/boxal
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d83.bin
153a7be8078b348e3b28fdf75f27ed5333c4b585f430fb4369965f0cf489de72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 5260 bytes
font_01_sfnt_off00011f6a.bin
25cfd05308190aafb5b2d93560cf20d2d43b3b2e5892ce81951e930dccd03406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 11500 bytes

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