Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f28289c430c02c2…

MALICIOUS

PDF

71.5 KB Created: 2021-03-23 04:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 551b89a139e80a1c526d841d35bf6dc9 SHA-1: da77b77bfb897b6bb1b6b925efe5aacb1a02aee7 SHA-256: 7f28289c430c02c29b3a19f4e84530a6a142ef45f05f6c1a239cfda8fcc46e10
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 0.9989

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://pelibifir.ru/123?utm_term=beige+long+formal+dress PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446650/normal_603d310a21cb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fc71b75067e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ff490eb65d56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fe41eba6209f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_604cea1154278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fda817c7ca22.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/geror.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fe17bd2ca754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_60167de720e15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5ffb2559705bf.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/33314289953.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/17547604865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34cfe3aaae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499984/normal_60245ef26c6c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_602428515708b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_6758312ba3e641efba06e1786ee67dd3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f29de62-cdc3-4c80-91ca-e37aa64b613d/difference_between_cycleops_fluid_and_fluid_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69c6e40-1216-4f86-9b00-2b0398d77726/blackberry_classic_2020_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b1a69e-35c9-41c6-a8a2-25ac77ef7fe9/reply_to_thank_you_email_from_manager.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_5b422ca8f2d14bc7a421d173d05ee627.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/487ef4b4-5430-4c8b-b6d2-1b00811d858a/world_political_map_outline_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa0ab6e-1ef1-4a94-b2ca-f64cec3dec23/how_to_open_command_prompt_safe_mode.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/nijonetosameperijexa.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_c70eb52b112f491bbd5c6a7e67e0358e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 4984 bytes
SHA-256: 34f37153ecadc19202335dee880f5b24135dbcb95f958f3028d0dcf9c691ef6e
font_01_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 10552 bytes
SHA-256: c33761d3641631e88b52073b76c366670c84ad3373a58173c5fb6671e37184ea
font_02_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3