Malicious PDF — malware analysis report

Static analysis result for SHA-256 987f500534347366…

MALICIOUS

PDF

80.5 KB Created: 2021-02-28 14:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e064afebe7eb9777d2c066d247160759 SHA-1: 1525921b29bd141999d061db07f538de22c096dc SHA-256: 987f50053434736637ed00cbd4634e4b2a2b6266d00081c85c893e726028bae4
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with a primary one pointing to 'nipisod.ru', suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, commonly used for malicious redirection.

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=sniper+guide+warzone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371790/normal_600a0bbfcfd6f.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/aSrhgjd/voice_auto_tuner_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421471/normal_6005b03b4e569.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/5Hj0icl/74103947088.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/gedelazodun-zutirivevareti.pdfIn PDF document text
    • http://razixir.22web.org/14283185079.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/problems_as_opportunities_quotes.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/lasewi.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/nikigeromitakidanan.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/39854009528.pdfIn PDF document text
    • https://pozebukewif.weebly.com/uploads/1/3/4/3/134330137/pofasobifejaxe_keduvasale.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_was_the_planet_uranus_originally_called.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozogasivufi.myartsonline.com/add_drivers_to_windows_7_iso_ntlite.pdfIn PDF document text
    • http://finubovuputok.epizy.com/44609693793.pdfIn PDF document text
    • http://bupujipa.epizy.com/23473801226.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/lowum.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_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 5160 bytes
SHA-256: 966d3c7c3a9c734836079d1574a7a093b5aa5a5161635815696896dd0b918389
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 10208 bytes
SHA-256: 4fe458e683d7b1b4d86d70e34cffe6ba6966367d6003a0214ff1ef0b61965402

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