Malicious PDF — malware analysis report

Static analysis result for SHA-256 154aec1337d8e95a…

MALICIOUS

PDF

83.7 KB Created: 2021-04-17 20:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be46407ec6e37a77d272d506959d4db1 SHA-1: c128c9d932e2ab753fa55582cc15dc436d999249 SHA-256: 154aec1337d8e95ac332ca3d2cf73830d47a50a6101cc529e7b92d3d8f4af468
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file 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 related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://leonvi.ru/strik?utm_term=principle+of+finality+law PDF link annotation
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/lewofi-winujo.pdfIn PDF document text
    • https://rikomurisixub.weebly.com/uploads/1/3/1/4/131454733/5069471.pdfIn PDF document text
    • https://cdn.sqhk.co/nawinirezuj/aiijahb/wonudoxebabeja.pdfIn PDF document text
    • https://zuwulixomelonib.weebly.com/uploads/1/3/4/3/134385653/fatuxewevefafareko.pdfIn PDF document text
    • http://cetop.xyz/raxenutetiboposijorerobsoto2.pdfIn PDF document text
    • http://instup.xyz/chess_openings_for_black_explained76l93.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/gehdFhb/wimareko.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/6OhiV1h/lobopamuxukitubaxagulur.pdfIn PDF document text
    • http://doorstepcomputers.com/how_to_become_icf_certified_coach2ow2n.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/Q1KUgjS/sukimunisuwurozarevaj.pdfIn PDF document text
    • https://cdn.sqhk.co/ziwetuvije/hc9EFja/amritsar_shatabdi_platform_in_delhi.pdfIn PDF document text
    • https://bilurowunolip.weebly.com/uploads/1/3/4/3/134316979/05b86bee00d295.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/tomalalegod.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/ahf5EAa/home_ice_cream_delivery_truck.pdfIn PDF document text
    • http://salebox.shop/hampstead_and_kilburn_uk_polling_reporttl1qh.pdfIn PDF document text
    • https://cdn.sqhk.co/xegigujatefa/rjyPihX/bay_fishing_guides_south_padre_island.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/1hjnIk7/97277837120.pdfIn PDF document text
    • https://cdn.sqhk.co/zigimovovu/5DFid4B/funny_anime_movies_english_dubbed.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/7hfjd03/dapakutixudiwejo.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/c046e85d-4c91-44c5-96fd-3a79c6ad88df/67908864800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06512a92-1128-443a-8f79-48a397e73bd6/que_es_mecanica_dental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fa9c9f-4062-4473-85e1-97a10f947005/logafobivumaxifukesifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b563f0d9-37f8-491e-aca1-1a0ec8ba71f8/42743163265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e316bf-a35b-457b-95a1-a8ac54a9ae66/craftsman_air_compressor_20_gallon_not_building_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e97a56-7678-4db3-9202-d1f8aee6d5f6/vuzofevupem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc67208c-4d3f-4203-a514-9dbfa657a1da/why_is_my_dryer_not_fully_drying_my_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb77a9e-d337-481e-b91e-6508bdd92b6d/mmpi-2_definition_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9bc27eb-bb99-4c60-8c60-9c9c9bc1bb73/7460774306.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_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 5028 bytes
SHA-256: 49f28301fb79f3caf6953a531dc5a585e3a368e2ed7e5a58fe13824017a037fd
font_01_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 11296 bytes
SHA-256: a169bf7830b82a6a6810ad683a5e57af31667d7ea30a1b9f4b561696504267ac

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