Malicious PDF — malware analysis report

Static analysis result for SHA-256 a909d299244fcde4…

MALICIOUS

PDF

75.6 KB Created: 2021-05-07 16:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a4ba0fe786924d9f853eb2abb54de436 SHA-1: 07480f2574ea6757263cff6c9f5491caa6b13935 SHA-256: a909d299244fcde4547139289455139e2399a70f02f09e73857efd26040b5c04
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful websites.

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
  • 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://fokemale.ru/strik?utm_term=what+is+a+contradictory+statement+called PDF link annotation
    • http://peguxukeziku.sportsontheweb.net/enterobacterias_libros.pdfIn PDF document text
    • http://about-igsupport.com/4631027692u6ak1.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_600817fc51bda.pdfIn PDF document text
    • http://savetewolixoful.iblogger.org/ranaritevupe.pdfIn PDF document text
    • http://loxebosobudi.66ghz.com/georgia_drivers_license_permit_study_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5ffe878a88f67.pdfIn PDF document text
    • https://zusikemibuv.weebly.com/uploads/1/3/1/6/131606719/3051407.pdfIn PDF document text
    • http://lovechat24.club/what_does_f2_mean_on_whirlpool_duet_washer1ayxi.pdfIn PDF document text
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/5836989.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/liwara/89348490976.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/tcp_ip_model_network_access_layer_protocols.pdfIn PDF document text
    • http://deriwamunul.rf.gd/a_level_physics_edexcel_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/oracle_api_platform_cloud_service_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/spotify_lite_apk_mirror.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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 5292 bytes
SHA-256: 4386a60e44902e183ff79c8495d2490f40e61ddf1a059b38eb571eef01856adc
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 10704 bytes
SHA-256: ddf231042c5caf81f092cc9ade390775a12de88c6120e4985738cd3129a901ea

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