Malicious PDF — malware analysis report

Static analysis result for SHA-256 c320b0ff9a141e2a…

MALICIOUS

PDF

85.6 KB Created: 2021-05-18 01:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 475e8458ec98525de59abd84462c4262 SHA-1: d3add2d47443f9a0db491f7cceb7b1ec2b3ffb49 SHA-256: c320b0ff9a141e2afb1fc3dfa676c3a9774b61f2b661ef600206b2218dc4faff
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=mastering+diabetes+food+list+pdf
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fdfa262c69ea.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_604d1d2e2d6bb.pdf
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fd3574041685.pdf
    • http://kavuxusexilu.22web.org/dosis_antasida_sirup_anak.pdf
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/03b61998d7.pdf
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5fe4897542e45.pdf
    • https://berosafeteroz.weebly.com/uploads/1/3/4/8/134885041/5e95d39e29a8.pdf
    • https://xizonadap.weebly.com/uploads/1/3/5/3/135326441/majonidowa.pdf
    • https://cdn-cms.f-static.net/uploads/4415930/normal_60290077f188f.pdf
    • https://cdn-cms.f-static.net/uploads/4420906/normal_60216a11b5fe8.pdf
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/rerikisakakegoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4469353/normal_602ac2a2200fc.pdf
    • http://zisujetev.iblogger.org/quimica_inorganica.pdf
    • https://cdn-cms.f-static.net/uploads/4366045/normal_605f42c06f992.pdf
    • https://cdn-cms.f-static.net/uploads/4417129/normal_600c7a1ede57e.pdf
    • https://cdn-cms.f-static.net/uploads/4459645/normal_606b3ea80044c.pdf
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/jejupe.pdf
    • https://cdn-cms.f-static.net/uploads/4489983/normal_6039fe2ad1d1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sizadagazagaj/73799035090.pdf
    • https://s3.amazonaws.com/seriposuj/maumee_river_fishing_report.pdf
    • http://lefanivewog.epizy.com/vetemeburozeboke.pdf
    • https://s3.amazonaws.com/betefowubevat/77777812928.pdf
    • http://dixuzudes.epizy.com/the_psychology_of_winning_by_denis_waitley.pdf
    • https://s3.amazonaws.com/pubopelej/simple_ecommerce_website_bootstrap_templates.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_off00010eee.bin
67a3a3598248d8483aea9f7b89eafc5b8efcbc2f77ab73b2ee7987fcdf1acd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 5352 bytes
font_01_sfnt_off00012136.bin
66c55b5a14400934341ee8630c8ba57eadc4a5f61e07fa3139c49136528b9c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 11720 bytes

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