Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e8b87cd6166434…

MALICIOUS

PDF

82.0 KB Created: 2021-04-07 15:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4aef98eba2d92a1f4df00adabc604b2e SHA-1: 6c8e6e43bcb625f5ea92880c2e1f231eb339b0b7 SHA-256: d5e8b87cd6166434b3f2aed15fffad564f81aacfe483a3c9c3b017eff5a983ac
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://leonvi.ru/strik?utm_term=what+is+men%2527s+shed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391611/normal_603a091b5cb93.pdfIn PDF document text
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/refumupiripodu.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/972097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368971/normal_5fec67430f0d1.pdfIn PDF document text
    • https://kibewuzogoluwiw.weebly.com/uploads/1/3/1/6/131636689/ninoxigerifevivap.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/40370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_6028ba3181aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_604a8a3c69eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_606caee00a42e.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/2412705.pdfIn PDF document text
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/mezixesabidiwab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6057988562ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_605c875bf0e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_603e27a074c39.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/3ec761ef-f372-44c5-aea6-d590abc1707d/fisher_price_snug_a_puppy_bouncer_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42830f36-064f-49c4-910e-3755be9cd86c/buguzexosuzesesinera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68174e57-0c75-4cee-957f-5d87a3ec69d9/important_quotes_from_the_importance_of_being_earnest_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85aa54cf-42ee-47a8-b908-e2d016a12b0f/68341546379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9ac4f0-26a4-4d14-968d-cea43102b289/honda_rebel_for_sale_portland_oregon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69de265f-95f0-4d5b-ab63-4b9ea8867f1b/marebixojavobuwudoseris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b939348-cac2-40b0-af49-c9952d87661e/318-14_building_code_requirements_for_structural_concrete_and_commentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cca447e-021b-4588-97e5-c08bb8af7501/tippmann_98_paintball_gun_price.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_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 4984 bytes
SHA-256: 5a92dbc4eae444e46ad30755fe3be8696d523117393ed9323078a0ce8787b031
font_01_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 11196 bytes
SHA-256: 21d50b5677587115eea5583085dc29ab1f15246c3dece9886f753882859b948d