Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89b46a7eded0ba0…

MALICIOUS

PDF

126.1 KB Created: 2021-03-28 22:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca4889096f7e7e2e16977aac83e35aff SHA-1: eb2a42f86e8b837ac4b37b1ea1413faf46d7e01f SHA-256: a89b46a7eded0ba0d6d7384e9b8ccd61951a0f6554d3e1d95099c7a34ba1e5fd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=tamil+tv+ads+video+free PDF link annotation
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/nipusew.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/3a018d.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/febinogevakete.pdfIn PDF document text
    • https://tanatomunedasov.weebly.com/uploads/1/3/5/3/135325499/titabizazo-gagefemus.pdfIn PDF document text
    • https://vavozeja.weebly.com/uploads/1/3/5/3/135308761/forog-veloguzep-musogujamonu.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/yjajjco/41334644642.pdfIn PDF document text
    • http://onkoprofi.ru/wupodabopotelesavelarui.pdfIn PDF document text
    • https://rudorigafeba.weebly.com/uploads/1/3/4/8/134899211/zuriwat_bebupavu.pdfIn PDF document text
    • https://labuxodapiju.weebly.com/uploads/1/3/4/4/134492440/5819ca.pdfIn PDF document text
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/4363394.pdfIn PDF document text
    • http://micrometer25bill.site/71329975238we6nc.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/Yidv3jb/amazon_seller_app_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/jbiclh9/tie_dye_shirt_patterns_rubber_bands.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/169cc63d-7365-4d8c-93b9-530937319b1c/movedefegezaxora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54967dea-c12a-4fc7-8590-539d261045c7/my_kitchenaid_food_processor_attachment_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110a0468-913e-4ac7-9323-59b3cfe53561/nibemavigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33125cba-e330-401d-9994-ebde41452064/stihl_025_chainsaw_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdae980-a31d-4ed0-91b3-309832def82d/fugigavifodovilinaropake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed5c295-3c72-415e-bc7b-14962fb7cd45/kuworowubef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a85f25c-316f-4ec9-ba85-a432ec9e6243/subuletovudaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb41f2e-eabe-4dca-9103-80480aa7be71/49298966949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cff573c-3edb-44f0-8a83-5cb60eda7653/jaxenepejudizonede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ad87cc-b416-42bf-badf-3b7521a06597/what_is_proportion_in_principles_of_design.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_off0001b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B13B 5064 bytes
SHA-256: 0c3c08f3d0e2f69ce8884c086a0d3122a7fc784995448bfcb458bf8d157b7c3f
font_01_sfnt_off0001c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C261 11900 bytes
SHA-256: 2b2faf1eb999986e7b3b81dcfa5ed58d08eb985982fb0321bcf33bd1c7ef27ae