Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb943ca24898535…

MALICIOUS

PDF

77.9 KB Created: 2021-05-30 01:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a06d0fc7fd37706e34080ba49a0fcb6d SHA-1: 11c58137f3871aa5318dedc1b8d17a468f4b1122 SHA-256: ddb943ca24898535157fc52430abc28e4279e6eadbeb25514e851f0d4b6cf785
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 0.9997

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://seumenha.ru/strik?utm_term=harcourt+grammar+practice+book+grade+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fcdd1a5e6604.pdfIn PDF document text
    • https://kodupupagunoj.weebly.com/uploads/1/3/4/3/134314474/mutim.pdfIn PDF document text
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/5468f960af97.pdfIn PDF document text
    • https://rajulotopeza.weebly.com/uploads/1/3/4/6/134665566/zikogijif_xafupofazogoli_vurekab_sofidibaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fe89a70ac9e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5fdea2dd4f093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_600dcef51cf27.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/bd898a87ea.pdfIn PDF document text
    • https://wazurewimi.weebly.com/uploads/1/3/4/5/134598950/vovuvonigezuwopif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_603ba58aeb102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_60361757c6a5c.pdfIn PDF document text
    • https://xubebivox.weebly.com/uploads/1/3/5/3/135392957/6154194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fcc3eca6213b.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/fd7d80f8-1162-404f-907f-cf3fe9efe65c/samujigejosodoribipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc123188-cc5b-4e2c-8a51-ba7d8acc1a68/46850834176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02c3d80-0c82-4524-be6b-844e4be4543b/fighter_diet_wheat_bran_porridge_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bc1666-f7de-4f9f-bc3c-8cf147be9404/ragotevosabeloduxodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fa0adf-907a-496f-8800-67724da342ea/how_to_use_a_kindle_fire_hd8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2db19d-6f4a-4c09-9c1f-966c2aab610d/the_lottery_analysis_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac835b48-7787-40d3-99c6-93d4eb6b4950/fuketudazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef772cdd-f7ec-44d5-b136-213d82e8f8db/excel_2016_shortcuts_keys.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_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 5560 bytes
SHA-256: 10a27824ec16552bba950de0325aeaf28fbb5f678d778fa9353095fc96369cee
font_01_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 15892 bytes
SHA-256: 2362f9dbc6e70e41a57ba0eae7f88c60d150c24f30be395726db81f107ada35f