Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c3d5daffca8876…

MALICIOUS

PDF

74.4 KB Created: 2021-03-30 23:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc39ccb47e7a6365ab32e7f8893834aa SHA-1: a70696d2c1f7bd03b92173b3f3bba9ded83a04bd SHA-256: 57c3d5daffca887670c961c599d39b967a49d03814d965e07ae284a2edd7079c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many of which point to SEO-optimized PDF hosting sites, suggesting a link farm or content manipulation tactic. The embedded URLs, such as 'https://lozipotod.ru/wix?keyword=william+barclay+daily+study+bible+old+testament+pdf', are designed to mimic search results, likely to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/wix?keyword=william+barclay+daily+study+bible+old+testament+pdf
    • https://pitubesisimebi.weebly.com/uploads/1/3/2/6/132681325/695b131de.pdf
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/gapuram.pdf
    • https://cdn-cms.f-static.net/uploads/4464070/normal_605b8d161c3c7.pdf
    • http://mepuner.iblogger.org/vomileladelerok.pdf
    • http://tapadobav.iblogger.org/malaxupemokelas.pdf
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5ff78b5980625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nulesade.epizy.com/nifogobutoraladozezugeta.pdf
    • https://s3.amazonaws.com/sajatofubote/how_much_does_a_walk_in_cooler_cost.pdf
    • https://uploads.strikinglycdn.com/files/83853bd8-fd03-458f-bbee-97a9d9be9ba6/tage_frid_teaches_woodworking_download.pdf
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_3344420f907544ceb3924b3722ff7cc3.pdf?index=true
    • https://s3.amazonaws.com/tetenifeme/pejelomejabosabomen.pdf
    • https://s3.amazonaws.com/rebomedug/saxukibagafimosasunuwe.pdf
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_ccd7d8c0231e4dd290f78ae3350ccfd2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c16111e1-9a9e-4b68-85f7-d2b854effe6b/fixatovijorovevixowopa.pdf
    • https://s3.amazonaws.com/dojivewobasuval/complicated_cystitis_treatment_guidelines.pdf
    • https://s3.amazonaws.com/pujirageg/fitetevifejejojezed.pdf
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_63f22b4c14a54608baf1dcb3abb0ebf0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6d9d883-72c0-4d01-b9d6-29a20ad3b9ee/how_to_be_a_developmental_editor.pdf
    • https://uploads.strikinglycdn.com/files/f0e2f52f-d308-4b4f-ba55-167a8f30c823/sijolewojukujexexuren.pdf
    • https://uploads.strikinglycdn.com/files/d93a0e8e-e08a-4bb6-b1b4-29dde0d18f48/pegufutifodamejeziluwan.pdf
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_a3b4d98303cd4e9e8b28cea3d72c8bff.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_off0000e06f.bin
d839ddf650a3a381164ed898e285aec99f9275cd973a810e6ae3338ee8231991		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 5556 bytes
font_01_sfnt_off0000f348.bin
90194a6203923bb07f1c0c0f234fca5c9c31f9e72fd73fa910401a4d916ab929		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 12308 bytes

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