Malicious PDF — malware analysis report

Static analysis result for SHA-256 97660cbbf0ce16c7…

MALICIOUS

PDF

80.4 KB Created: 2021-05-16 07:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32a6f9bcb627ffca170bd31dd0a32eb2 SHA-1: d4c0a77013720192e0f66ddc5181545774c79895 SHA-256: 97660cbbf0ce16c7463c2676362e3abed184c71f54e75bc70caa2f5e3393ff84
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains, suggesting a link farm designed to direct users to malicious or spam content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the document body's deceptive title further support this, indicating a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=what+are+the+four+theories+of+child+development
    • http://farotosinotom.mywebcommunity.org/benim_hocam_corafya_harita.pdf
    • http://excschool.ru/movie_wood_2019_telugujhr1y.pdf
    • http://keysecret.ru/dalmax_checkers_pro_apk_freee7bsl.pdf
    • https://cdn-cms.f-static.net/uploads/4445888/normal_604e44b4cc918.pdf
    • http://jebebixazonutug.mypressonline.com/resistors_color_code_table.pdf
    • http://maddot.space/zomuvemimudelikizgbbqx.pdf
    • http://verifybadgesbusiness.com/form_c_submission_deadline_malaysia2nxei.pdf
    • http://kofodotig.sportsontheweb.net/paluri.pdf
    • http://stavki.link/biblical_meaning_of_6000d69tj.pdf
    • https://cdn-cms.f-static.net/uploads/4407777/normal_605b6f1a02bba.pdf
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5ff964f04459e.pdf
    • https://cdn-cms.f-static.net/uploads/4425214/normal_601e4af211bbe.pdf
    • http://kulinar2020.site/acupressure_points_in_kannadamrgep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_07b1c608b09f475db572003527452d49.pdf?index=true
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_5edd4599f1b4482aabdcf557cc52d8dd.pdf?index=true
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_07a7c12bdc9445bd825edbbd9eb40bfa.pdf?index=true
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_4a29f9f14e6b4a09983c6da4d5da2398.pdf?index=true
    • http://piwakitidi.onlinewebshop.net/18618209766.pdf
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_3b8458ff59f8465a81ea2ccf9171def5.pdf?index=true
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_9762089531344de08fb8e97891f7fd23.pdf?index=true
    • http://solarujarinobo.myartsonline.com/3d_to_step_online_free.pdf
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_ed71db39e0bf4bcdbc6d8db9d7f4246e.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_off0000fcbb.bin
5b1606aa827d9cb1e9a230e17ff5f7e66f1de1ab27dcb30271feb6641f1425ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 5468 bytes
font_01_sfnt_off00010f40.bin
2cc822037a48850211be002627489bd886f27f5b60d40ff87752dfaddd856efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 10948 bytes

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