Malicious PDF — malware analysis report

Static analysis result for SHA-256 687601df4716abf7…

MALICIOUS

PDF

75.7 KB Created: 2021-01-22 06:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dc94682eb33a7ae1168d0ff50548059a SHA-1: d324de55757485035d9a3e9c9fdd0ff5cc02ad78 SHA-256: 687601df4716abf7c0cb9006a01ced0a561da4e48c34e78c4eecf213371bec20
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, with one specific example being http://lokuvutifinulef.rf.gd/bonaladumerevubi.pdf, suggesting an attempt to distribute traffic to various potentially malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://maypoin.ru/123?utm_term=newman+hall+uiuc+dining PDF link annotation
    • https://cdn.sqhk.co/fegukajebaj/ieheOid/lakidutaxexofekabagewugu.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/sports_card_collection_store.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/puvopawamofakon-lumawagobe.pdfIn PDF document text
    • http://kutufirix.iblogger.org/ubuntu_16._04._5_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/UNzwwmN/bike_racing_3d_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ZjiQTYr/luxujopumovuj.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/hgyjdhb/suwufizokasapifomotunapa.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/rgigiKd/18119959472.pdfIn PDF document text
    • https://kilokuvawap.weebly.com/uploads/1/3/0/8/130874431/f39f3652c.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/ZnoyzHt/chicken_run_windham_ny_car_show.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/d23iaCK/ultimate_epic_battle_simulator_mac_os.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/heCheWZ/3051753604.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/8019668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokuvutifinulef.rf.gd/bonaladumerevubi.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/14231854619.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/18238965745.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/52143657238.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/neturiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/jifinukikosu.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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5140 bytes
SHA-256: 9b41bff651da9fa325261bdc55ef7bf7282dd534e67812db0123a545718cae51
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 11596 bytes
SHA-256: 73127ba5453d35452974aeba6c68a6a850c3485ff10188a90558cd2495577025

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