Malicious PDF — malware analysis report

Static analysis result for SHA-256 f386f3765f13dd29…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 22:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6af68466580e8b3fd2bc33d1f9ec5699 SHA-1: 71ae5abc83eb6c6f80b0459f38ff63f8ebd8d740 SHA-256: f386f3765f13dd29c8852fd4c186e3492e377dc2ff2af88b12abe1c36fa2dda9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. One of the embedded URLs, 'https://zajinet.ru/strik?utm_term=mick+foley+have+a+nice+day', is flagged as suspicious and likely leads to a malicious site. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or malicious content distribution scheme.

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 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.
  • 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://zajinet.ru/strik?utm_term=mick+foley+have+a+nice+day PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fcff4124c1ad.pdfIn PDF document text
    • http://gekatigemebosen.iblogger.org/typing_finger_position_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_6022dfbe6286a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_603c185f47fb9.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/tapexiw/5122839614.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/free_complaint_form_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/second_conditional_exercises_with_answers.pdfIn PDF document text
    • http://logururud.epizy.com/emerald_ash_borer_firewood_fact_sheet.pdfIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_92cd962cdf7c4402a72ed8d94ff12c1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/tasajuxefev.pdfIn PDF document text
    • http://vileleb.rf.gd/shark_steam_mop_replacement_pads_australia.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_f0ac4028aee5407cbbef5b4bf64e1589.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/19243481331.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/dozatigowazufujeguwolu.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/bbt_bank_locations_in_cary_north_carolina.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/in_vitro_embryogenesis_in_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/what_is_the_best_adjustable_air_bed.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 5064 bytes
SHA-256: 1114e02d8b42a446b9e78f9a0237c90d9201edd799b2acd12463fca3ca6f14b1
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 11092 bytes
SHA-256: f0cae5ec92e4b02b98062b27f8c5a1ec9f9b32c7c1de4140539d81c44a08e208

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