Malicious PDF — malware analysis report

Static analysis result for SHA-256 82586f66e19983b3…

MALICIOUS

PDF

74.9 KB Created: 2021-04-09 21:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c5c28fe4e3d37fd4f52c6bc52a504796 SHA-1: 581118468c71562fa197975c0bfa2553d5055a87 SHA-256: 82586f66e19983b3df53c0017d4b964e98968e969d54d9ec2dcda2fbaa6d9c40
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://druttle.ru/strik?utm_term=delonghi+pinguino+portable+air+conditioner+hose PDF link annotation
    • http://fbdirect.site/52172905825v04ju.pdfIn PDF document text
    • https://paterixif.weebly.com/uploads/1/3/1/4/131454766/daxezusakidile.pdfIn PDF document text
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/pamajetozawexizu.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/dbZhgnP/40389587425.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/sH8hjhd/good_gym_exercises_for_golfers.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/a4119544f127.pdfIn PDF document text
    • http://good-production18.site/how_much_is_a_lifetime_fitness_diamond_membershipmm78w.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/jbQjhKm/best_apple_watch_6_screen_protector.pdfIn PDF document text
    • http://dk-inc.xyz/minecraft_1._8_9_skyblock_map_downloadfy7de.pdfIn PDF document text
    • http://interior.estate/how_much_does_it_cost_to_get_a_counterbalance_forklift_licencexmx7m.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/g3VRasK/matchington_mansion_smiley_face.pdfIn PDF document text
    • http://winnerslm.space/gcse_english_papernaxr8.pdfIn PDF document text
    • http://all-host.site/kodopagubonekedikosi66wgx.pdfIn PDF document text
    • http://iwhite.space/89372708945j595t.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/hf0ykcv/ww1_trenches_rats_and_lice.pdfIn PDF document text
    • http://uscarins.info/mesadobasrp7n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_27ce16a90d1a463396fa2319f1b38bda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b41200-ab98-4cf4-b50e-b0630e26d95e/fulejutasanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d477ead-970b-401d-a21c-9ed4d8b2d4e0/math_puzzles_with_answers_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae2b3b7-044f-4a68-9f40-f6f81af7091b/rowoluretapili.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_6e05ef89a3bb499a9d5f7d8afa830e7a.pdf?index=trueIn 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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 5476 bytes
SHA-256: d83eea0f9beb77d15a052b8862730fd05df5ce0c007bf2b4ceea4d7567bce92d
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 11036 bytes
SHA-256: 9097a5b0bc5c93b8d3b32cbbd29a725b3639f2a8f4f2ac5b9bec8fa4e4e86a64