Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0442c84d4e64c5…

MALICIOUS

PDF

78.3 KB Created: 2021-04-30 13:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7588b27fbbdd021422562bd4e1ea55ae SHA-1: 22c5fd7006768634d5efa560591d3cbc7e507b60 SHA-256: 8d0442c84d4e64c5a753526272f7089c4d44e38a1497471b8333913da43eabdb
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=operation+iraqi+freedom+service+medal PDF link annotation
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/883310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_600dbfa971861.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/piforujirelemu.pdfIn PDF document text
    • http://philonio.online/how_to_attach_hoover_carpet_cleaner_attachmenttjni6.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/4007638.pdfIn PDF document text
    • https://tozabofosizo.weebly.com/uploads/1/3/5/3/135340530/maxefasa_dixonaj_mevel_pujudi.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/4de3f33cc68d69f.pdfIn PDF document text
    • http://lidlid.xyz/base_plate_design_spreadsheet_aiscw6dfr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_603d28b7c0d37.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/3ceb0c.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/wekala-sugebosig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_60397cce80fd8.pdfIn PDF document text
    • https://gepumisi.weebly.com/uploads/1/3/4/5/134517510/zikakorazon.pdfIn PDF document text
    • https://ratipixudaxixix.weebly.com/uploads/1/3/4/4/134472160/9a8dfcc18d2b46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fc84519971c2.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/punulozok.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/15daae5f-4b93-4841-93cb-1e8d13bdf7ae/genius_g750_charger_lights.pdfIn PDF document text
    • http://levuvov.epizy.com/adobe_premiere_pro_2020_pc_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0bc777-9a69-4193-9ad7-c9e2a3f7745d/lovaniguliger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c47ed8-3161-415f-be97-14536b0419be/99973571659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9421c859-2fac-404c-9218-991b78db8c70/f_table_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11538f3-3e85-4c72-9be7-744b45f87f0e/5583287834.pdfIn PDF document text
    • http://bolutiso.epizy.com/classroom_of_the_elite_light_novel_volume_10_download.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_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 5512 bytes
SHA-256: 593b18dba677158278e9572364af0a611706cee36b64f91c510abd4549ab78ea
font_01_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 10864 bytes
SHA-256: 8044ea4fd419d427c144ca617c595d4cf3cbe9c58764d244308753994363a8ae