Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa017d6a0ac85c4a…

MALICIOUS

PDF

79.5 KB Created: 2021-04-04 11:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5da79cf6579df3b2282d5492049642 SHA-1: 7ec364a0958b368d831071b575b4b3a864f146d1 SHA-256: fa017d6a0ac85c4af561203c25170eb99df78d07e0b93464ecd33c9538d5dd4b
186 Risk Score

Malware Insights

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

The PDF file contains numerous 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 phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 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://lozipotod.ru/123?utm_term=conan+exiles+solo+guide+2019
    • https://cdn.sqhk.co/gedugari/rjauhiu/caddie_woodlawn_book_report.pdf
    • https://tonurokekar.weebly.com/uploads/1/3/4/4/134456200/f2d08b9b664.pdf
    • https://cdn.sqhk.co/libobivole/sgfghji/major_league_rugby_2021_season.pdf
    • https://cdn.sqhk.co/finulepaf/etoZjeN/bokiwuputisoso.pdf
    • https://cdn.sqhk.co/walumupo/V9ie0fc/international_calling_app_free_trial.pdf
    • https://nelotimef.weebly.com/uploads/1/3/2/7/132740277/mupajuduj_saxumowetoki_vixilur.pdf
    • https://cdn.sqhk.co/fosikikevo/hfihidW/gidetebujixawokum.pdf
    • https://meluwirukumipi.weebly.com/uploads/1/3/1/4/131483006/5956201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_839bd17c9d32417aae04bd30bdb8d3ad.pdf?index=true
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_42eb3d7e0e104a3287f01bb2fd807740.pdf?index=true
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_24d19a47e28e47408c763796e842b821.pdf?index=true
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_db57c17762fd42439c49d1b24b67e98f.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_91457b635b764628a21a23766736f5d7.pdf?index=true
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_d3607ddd11cd4bc9b0f06a97695ef3f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf7f99e8-f82f-4ea5-9376-520edffc8878/gosejiwepawelimadogexu.pdf
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_1ca1d410eef54e07b827b79a4590fdb2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0359687-a125-4b92-8477-9dbe6edc6b64/the_river_church_tampa_staff.pdf
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_710f8a32382742079de014e77826f87f.pdf?index=true
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_f221607eaeb44417a91c305dd971e474.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_264c4ba9a23347f18aed9b47fd9c3e8c.pdf?index=true
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_0b8bf858571a4929afda4d2ea887062f.pdf?index=true
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_92c38e2a37464b1abb5edc2325482a91.pdf?index=true
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_1af5b2caa8cd4d11811ec8cc13115dc3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa96.bin
1e9cb571ae2e3acfc9af055d6c4a4681f18e4b24799b43261d85f13564ef880b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 5352 bytes
font_01_sfnt_off00010cdf.bin
83c8abd6a15795a6598d636d64ec33dcff267ca0c80d2104fd6788a5a3cb74be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 10384 bytes