Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c79f74af71a7b2…

MALICIOUS

PDF

66.1 KB Created: 2021-02-22 01:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b4813a7ae250ca68c9e13bcfb166c88f SHA-1: 156dcf3a5c952e9910935fa3686218d98a139731 SHA-256: 00c79f74af71a7b2fc3ce1c44c48b2de8e3a62b690d3d3601639da06d81c1142
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=how+to+read+furnace+serial+numbers PDF link annotation
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/7550e17e7.pdfIn PDF document text
    • http://onenature.space/ceh_v10_certified_ethical_hacker_stu1ulim.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/6mcjijj/2020_nfl_football_schedule_week_1.pdfIn PDF document text
    • http://pakisonuzaruwav.iblogger.org/malawemogober.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/ijib3ii/ringtones_free_download_telugu_love.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/1a1dabc00348668.pdfIn PDF document text
    • http://imm-shoes2.club/lucky_block_minecraft_command_1._1477088.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/cjeibU7/survey_heart_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/Q4SRege/jukevom.pdfIn PDF document text
    • http://brumbum2.xyz/wajipokozabfx8k.pdfIn PDF document text
    • http://4kuhd.me/chi_sun_college_roomjkhia.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/gfMmlI2/tikesu.pdfIn PDF document text
    • http://sbrf.link/ganpati_bhajan_in_hindi452rp.pdfIn PDF document text
    • http://todolosepaxo.iblogger.org/blender_2.8_tutorials_free.pdfIn PDF document text
    • https://dulebolipema.weebly.com/uploads/1/3/5/9/135997598/3664234.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/mejobu/batman_beyond_batarang_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/mujasetujijuzagiwefemada.pdfIn PDF document text
    • http://zenifipepodu.rf.gd/rizitagotezuwiti.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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 5360 bytes
SHA-256: 44cc21ac150611a233240799aa7a4f8d1e14f3e4add7bc2b1d72a6e7a378df4e
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 10376 bytes
SHA-256: 888644bb03fe0f379660036d9762700c861b9ee11dfee39bf22ddbfd9a65453d

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