Malicious PDF — malware analysis report

Static analysis result for SHA-256 7602fabd69c19a8c…

MALICIOUS

PDF

81.1 KB Created: 2021-04-12 21:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 980d233a6d4099da4c724832fa35c025 SHA-1: 915f0f847d0f8bd9baf23518ac6a9fe94a4ab24b SHA-256: 7602fabd69c19a8c269a4753f2691a75c683700abe90d0401e470e39b199f077
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites for further exploitation.

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://nipisod.ru/strik?utm_term=m-audio+keystation+88es+usb+midi+keyboard+controller PDF link annotation
    • https://cdn.sqhk.co/kinifukix/i3en7jh/sudoku_competition_in_delhi_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5ff1bc4f7fcbb.pdfIn PDF document text
    • http://amorexpo.com/saxon_math_course_3_cumulative_test_18a_answersbc568.pdfIn PDF document text
    • http://zaxijejolegodur.iblogger.org/fuvukerulitasimilisagin.pdfIn PDF document text
    • http://netikuradad.22web.org/bge_peak_rewards_thermostat_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_6004c2ba2b558.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/1781829912.pdfIn PDF document text
    • http://ru-1.casa/gevoravuminifokikarit134p.pdfIn PDF document text
    • http://inostrana.com/47940039585vcbsz.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/ieV6Zig/notes_in_spanish_gold_transcript.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_600a041c7a210.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/dqjcgio/megan_rapinoe_sue_bird_haircut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jupevesu.atwebpages.com/jurnal_cerebral_palsy_athetoid.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/coursera_financial_markets_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/fifavilalifuwowuzero.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/zelda_ocarina_of_time_song_of_storms_guitar_tabs.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/nintendo_error_code_2-arvha-0000.pdfIn PDF document text
    • http://nebaxowowugi.rf.gd/73212057567.pdfIn PDF document text
    • http://xujariju.epizy.com/61612100957.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 5504 bytes
SHA-256: 51808739f29fb72f181b3666a64f1a4318452e4ded519d4910532ea77afea830
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 10636 bytes
SHA-256: d5a9e6e1fd1b9a3998ce5aded073c9cd7e61a0822d505998fcf28c96bde9a08b
font_02_sfnt_off0001288b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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