Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf9367b23f487ec…

MALICIOUS

PDF

85.5 KB Created: 2021-02-27 16:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a9f8a0454aea3c205b8e7d11f7d53256 SHA-1: a2155900b6d9c58a6f83449cd0280b734b7d6e54 SHA-256: 3cf9367b23f487eccca091addfb84cadc212753ba8004fa19b489b8348485cb0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic point towards a phishing or malware distribution scheme.

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://dafemum.ru/strik?utm_term=maytag+neptune+dryer+mde5500ayw+capacity PDF link annotation
    • https://dumosube.weebly.com/uploads/1/3/1/1/131163669/xafax-mobakizevune-miwisakozo.pdfIn PDF document text
    • https://neruzokari.weebly.com/uploads/1/3/1/1/131164447/wotukefagu-nakojon-gosidupogedu.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/8750660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/vobigoxurigusipafo.pdfIn PDF document text
    • http://zobatokuvanoz.epizy.com/durelezogixipovakilowedej.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/macbook_pro_retina_buyers_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/71307653967.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/pubg_mobile_lite_hack_apk.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/18677536365.pdfIn PDF document text
    • http://labukifured.epizy.com/facebook_apk_4._4._2.pdfIn PDF document text
    • http://fiwipofel.epizy.com/shazam_radio_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/59031738335.pdfIn PDF document text
    • http://duwagisu.epizy.com/information_system_support_decision_making.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_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 5648 bytes
SHA-256: 610a79106c72a62a54a6739d69d11fe2192e54ebbd60b58bab5f57c4f7d2f463
font_01_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 11980 bytes
SHA-256: c002e3b324084d61c3f2f3c2812f7ff6fc8ee6a5842f4c4ed66f7146e9ddf3aa

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