Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bbba392c334286…

MALICIOUS

PDF

71.0 KB Created: 2021-02-16 02:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 892a00ee7391980716a51ad7bfd139da SHA-1: dde5d55d87af8bb66898193e77a76525ef259796 SHA-256: c3bbba392c33428643551de080742a8b2ac508f842ff35b0e9adffbf3cba485e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'bologen.ru' which is associated with a search query for 'suzuki violin book 1 pdf piano', suggesting a phishing or malware distribution lure. The presence of multiple links on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=suzuki+violin+book+1+pdf+piano PDF link annotation
    • http://xadejidigakezu.iblogger.org/vernier_caliper_experiment_video.pdfIn PDF document text
    • http://zafidobavamus.22web.org/34348435710.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/fake_love_piano_sheet_music_easyma3dc.pdfIn PDF document text
    • http://vanesifonemume.22web.org/30248239434.pdfIn PDF document text
    • http://ejqy.com/81803523100loj4j.pdfIn PDF document text
    • http://depotupunejiwo.iblogger.org/15985035200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gugakalorezo.epizy.com/27149629159.pdfIn PDF document text
    • http://lupugavediroz.rf.gd/dorset_evening_echo_gig_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/artichoke_s_heart_suzanne_supplee.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/97351743809.pdfIn PDF document text
    • http://gefetela.epizy.com/balfour_college_ring_adjustment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/vetafepa.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/38672104391.pdfIn PDF document text
    • http://dopamirep.epizy.com/bus_games_free_city_bus.pdfIn PDF document text
    • http://zunebodiz.epizy.com/wisexaxabuxoli.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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 5232 bytes
SHA-256: 621761d02f13cd3d1ca57417d962fa2d058bf1fddbe3a095ec71c298b0686c5b
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 10976 bytes
SHA-256: 6957465d9a6f6033201009c7e3c5511b4d659e14a6069cac98eb6a4e19d456dc

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