Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc552332e6f6f06…

MALICIOUS

PDF

76.8 KB Created: 2021-04-29 14:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e1cf39a23ae80c62052e0df57ffc0b90 SHA-1: 88affe95d67aab56fc95cd91b1aa321da1602096 SHA-256: 6cc552332e6f6f066e1352abe8fb947f1515f703450d03d66b3021c6d2c03208
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=diy+home+improvements+for+beginners PDF link annotation
    • http://rebelliona.online/free_bird_piano_sheet_musicpe91q.pdfIn PDF document text
    • https://mixizuvas.weebly.com/uploads/1/3/5/3/135383824/2467107.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/guzapalubimuxijez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_605c90687dd69.pdfIn PDF document text
    • http://kpupnov.pro/sexcraft_mod_minecraft_1._7_10tbgyy.pdfIn PDF document text
    • http://kvrovk.xyz/18005989382hgx7m.pdfIn PDF document text
    • https://fikoroviv.weebly.com/uploads/1/3/0/7/130740338/roguj.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/35f74.pdfIn PDF document text
    • http://info-pages.ru/street_legal_racing_car_listr9udz.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/18166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6017156ed87c3.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/duboxituma-towiruzevo-rasukorevetadoj.pdfIn PDF document text
    • http://vitalia-transports.com/polaris_trail_boss_250_parts_diagramydyef.pdfIn PDF document text
    • https://revapukas.weebly.com/uploads/1/3/5/3/135323612/bepimelivisirukalo.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/1491860.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/porikekozid-tapejezavo-fadofivevovop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_605b8242bb761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/405e7d64-72a1-4e39-9aae-b15f8114444b/binomial_theorem_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6098cb4a-c6a6-45c8-b042-e17b30a3ea16/how_to_organize_fly_tying_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/attack_on_titan_season_3_part_1_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/can_t_buy_me_love_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75c72d7-d63c-4bcb-91fb-b1d5efa2c6e6/how_much_is_international_postage_from_canada_2020.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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 5376 bytes
SHA-256: 85fdbf11c5eb23296358332f47ef15475d3f52033a5292ab45892de335a5be67
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10308 bytes
SHA-256: 4c39db2d178075712cf2946d0b38eceb0d5c57ef598db94aff88ddedf147cb66