Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c89466e60dd793…

MALICIOUS

PDF

66.1 KB Created: 2021-03-25 03:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9d53e3adde27e45d92b622917867728e SHA-1: 69921acb7bf274611f641086b033e9fe5b7ddf2e SHA-256: 50c89466e60dd7930249e392706fd20046af33981d43b0219055c99d615a592f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary focus on `https://nipisod.ru/wix?keyword=blank+coat+of+arms+png`, suggesting an attempt to redirect users to potentially harmful content. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings point towards a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://nipisod.ru/wix?keyword=blank+coat+of+arms+png PDF link annotation
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/nefozix_senezokawufujeg.pdfIn PDF document text
    • http://agentsoft.space/samsung_6100_vs_63000ofrc.pdfIn PDF document text
    • http://omoikiri.info/formal_charge_of_boron_in_bh4dt979.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/8293065775.pdfIn PDF document text
    • http://reduslim-italia.website/recarga_facil_vivoeauqf.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/toyota_carina_e_user_manual.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/disadvantages_of_sexual_reproductiontwnm4.pdfIn PDF document text
    • http://timedezalug.iblogger.org/77598357825.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/7b89eb76bd.pdfIn PDF document text
    • http://flylovel.com/what_are_the_benefits_of_server_virtualizationjavcs.pdfIn PDF document text
    • http://keepmaxi.space/sosumiz20rsh.pdfIn PDF document text
    • http://galoomer.online/pathfinder_critical_hit_generatorcfrd8.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/135c7bdd-6c61-4697-8dec-0b9d9269712f/2810017087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e5e8de-e2e3-428a-b438-b87d7caee421/dr_simeons_pounds_and_inches_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1108ada-e8c5-4de8-bc35-ac8d71de3367/how_much_is_samsung_galaxy_s9_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569bec54-3a18-4858-b408-b76594fb1fd7/migadefedatuxir.pdfIn PDF document text
    • http://gikunipif.epizy.com/33516866002.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_off0000c4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E0 5448 bytes
SHA-256: 18fbc5f8bdc5c1fccdf103eae9112d5e0eef083b47c9bb172e4e03b9f4fa9787
font_01_sfnt_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10112 bytes
SHA-256: 873741c9f50f3488f360f2201e6efc9b1ab34d3d8cfcc22a338659bc0aae62de

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