Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c100b1f09aafa1…

MALICIOUS

PDF

77.3 KB Created: 2021-03-24 18:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d65460994811bd99b4fe5761cd4241b SHA-1: ad1600a092dfbeda013d48154722086bb3083fcc SHA-256: 01c100b1f09aafa1e433db4f8d5cfadfab8c909d70cfe898929280f6f9a72df8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the document is part of a larger campaign to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=diaphragmatic+breathing+for+anxiety+pdf
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/zuguxerafavef.pdf
    • https://cdn-cms.f-static.net/uploads/4402533/normal_6030d6232b51d.pdf
    • https://static.s123-cdn-static.com/uploads/4387566/normal_6004f8e44e122.pdf
    • https://cdn-cms.f-static.net/uploads/4465025/normal_604843060a5ab.pdf
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/1905887.pdf
    • https://cdn-cms.f-static.net/uploads/4462073/normal_600a3f2bce1bc.pdf
    • https://cdn-cms.f-static.net/uploads/4462678/normal_603386e47cf7f.pdf
    • https://cdn-cms.f-static.net/uploads/4424985/normal_602930cd2e3de.pdf
    • https://belesekazisose.weebly.com/uploads/1/3/5/3/135397511/fupakufap_zamowival_tukarorojava.pdf
    • https://cdn-cms.f-static.net/uploads/4491946/normal_6030fe0af2d7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/retobifulipo/92315207660.pdf
    • https://s3.amazonaws.com/seriposuj/baliwojeseduluparokuxa.pdf
    • https://s3.amazonaws.com/vonutavekip/sebi_guidelines_for_mutual_funds_ppt.pdf
    • https://s3.amazonaws.com/buganabowumujef/kirchhoff_s_rules_lab_report_theory.pdf
    • https://uploads.strikinglycdn.com/files/04dae604-47ff-49bb-ac33-9f26a1d392cc/73928824048.pdf
    • https://s3.amazonaws.com/somamere/2012_polaris_ranger_800_crew_front_differential_rebuild_kit.pdf
    • https://uploads.strikinglycdn.com/files/5a609abe-4521-445e-ba87-bd4d1dcf0125/what_is_the_best_bleaching_cream_for_dark_spots.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_off0000f1df.bin
b5d7dffee2f93834e1ff83484eee9fc73b111f5c0af58f0c307c58bd6376b272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 5668 bytes
font_01_sfnt_off00010516.bin
2860092655d964ca4371045158a3fa241b3b337b8b76efefdadab1085355d914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10048 bytes

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