Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7b4dd9562199f0…

MALICIOUS

PDF

83.5 KB Created: 2021-05-02 02:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a677ca63f930489ef40338bb03944d3e SHA-1: a3cdc7daf28b205e58783653b412d4a8f88892e8 SHA-256: be7b4dd9562199f08e0a75b8fb38cf0301b069adba7c5bc14cc647d080276c4c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded links and the nature of the heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=samsung+galaxy+s4+mini+hard+reset+button
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/5ba3f5f1f3f04bd.pdf
    • http://renakejopipelew.iblogger.org/abbyy_to_word_converter_crack.pdf
    • https://kukevukoleguko.weebly.com/uploads/1/3/4/2/134265740/799149.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/4d8e3e.pdf
    • https://cdn.sqhk.co/nozalodugavi/ihjbgd5/flexeril_and_alcohol_death.pdf
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/7278302.pdf
    • https://cdn.sqhk.co/vewukiziwemi/bzijgfo/32017164919.pdf
    • https://cdn.sqhk.co/tomubozes/i4Yshde/lidomeweridezi.pdf
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/6905766.pdf
    • https://kesetemokeze.weebly.com/uploads/1/3/2/6/132682820/pufijo.pdf
    • https://guxadudupis.weebly.com/uploads/1/3/4/7/134751999/kelovugirasud_jaguguzusejowew_voririwuvukam_mowix.pdf
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/e861d91e029cd45.pdf
    • http://kufigada.22web.org/42800375312.pdf
    • http://bolozofer.22web.org/teduriwa.pdf
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/tewabudakire.pdf
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/kuket-nutuvasenojit-sisefosafe-bizumezenemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mivokozibu/6988332123.pdf
    • https://s3.amazonaws.com/widuxade/85743291884.pdf
    • https://s3.amazonaws.com/falufusu/mcgraw_hill_psychology_chapter_2_quiz_answers.pdf
    • https://s3.amazonaws.com/fejatepudopito/t_lockett_injury_report.pdf
    • https://s3.amazonaws.com/pizexopenaxu/pasta_carbonara_nutritional_information.pdf
    • http://mujozigimak.rf.gd/18117404934.pdf
    • https://s3.amazonaws.com/tugumeb/american_society_of_civil_engineers_journal_of_the_environmental_engineering_division.pdf
    • https://s3.amazonaws.com/venunamazozuzo/cadence_simulation_software_free.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_off0001082b.bin
2803bf474456a2d29345816c8b02715182be875e3df2606a927f7956c9e70cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 5740 bytes
font_01_sfnt_off00011b96.bin
6cf19d55c862e02095b8d7f8f64e82c3fc6c52b47d84ae264c22b1765f794147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 10748 bytes

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