Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7b95023b5fc868…

MALICIOUS

PDF

71.0 KB Created: 2021-01-30 10:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1dc157a1aa15070f4d63755c14652ab7 SHA-1: 28e000c02e74360a61c56156e0881d936ccd6dd0 SHA-256: 9c7b95023b5fc868b7553e0ee5deda31ce60b67794a8d90faa6a3884e95cd8f6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to 'apk' and 'wkhtmltopdf', suggesting a potential lure for malicious software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/wb?keyword=steppy%20pants%20apk In PDF document text
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/03da8ad.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/91127842246.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/jozokabu.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hdkjsth/barbershop_3_music_soundtrack.pdfIn PDF document text
    • http://dijawobal.iblogger.org/wokegoparinufezaguzop.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/8254736.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/jikovavatabeperibof.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/3jiS7uN/mack_daddy_hair_salon_bristol.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/EhiEtG4/46098057957.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/jheUxin/xizelikagige.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/XhcP6PX/kukosirexopumejato.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ibdgeid/flight_pilot_simulator_3d_apk_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikilupari.epizy.com/starline_los_angeles_map.pdfIn PDF document text
    • http://porojerosisogu.rf.gd/bajomalerobalu.pdfIn PDF document text
    • http://kopididutal.epizy.com/walmart_bedroom_sheet_sets.pdfIn PDF document text
    • http://gerosopidazab.rf.gd/geometric_probability_distribution_questions_and_answers.pdfIn PDF document text
    • http://sobezoneroli.epizy.com/20033726613.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/47223808442.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/muxinexatinajewi.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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 4952 bytes
SHA-256: c6046ad5e994540aa7b49ecf8f5101e89350d8044de12cc56ffd7d1c7cce658d
font_01_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 11300 bytes
SHA-256: 4825fcfdf11741e671b7c76e22f9add919d5d8a15449de58c0e51a99011be988

Open this report in the interactive analyzer, or submit your own file for analysis.