Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a94d4eed97bd7a9…

MALICIOUS

PDF

108.5 KB Created: 2021-04-02 15:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eb90cd4a004f1e765baee59bb5553d5 SHA-1: 5334a7712bb59e985af128d10c1806a0bc613821 SHA-256: 5a94d4eed97bd7a9a2b3de34899a448e1ef683d77675de9e847be74f3af958a0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=what+is+roman+number+555
    • http://rosativiwam.mypressonline.com/cesarean_section_in_cow.pdf
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/sawex-nedodibenilo-nejulivapar.pdf
    • https://babaperivagam.weebly.com/uploads/1/3/1/3/131379833/zufejag.pdf
    • https://sesejeku.weebly.com/uploads/1/3/4/4/134495796/zupirinawuvosede.pdf
    • https://runizupila.weebly.com/uploads/1/3/4/3/134320381/5e82251945b.pdf
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/9806358.pdf
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/1f9db09422.pdf
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/rifolulu_torafetezuf_kesegakafogute.pdf
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/84a721.pdf
    • http://xupokaxe.medianewsonline.com/88529289631.pdf
    • http://palawawez.mypressonline.com/data_security_and_privacy_in_cloud_computing.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_1dc5efdb55704c86911f62b4dd8b4a71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/57188eea-3472-4465-b91f-3b9a79833e63/wajife.pdf
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_2a1a34699908417b958178687191ddec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5f44d5b8-09b0-4ef2-8902-7237495b33f1/avatar_the_promise_omnibus_uk.pdf
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_ec8e3aeb698e416db52182391ac860b0.pdf?index=true
    • https://s3.amazonaws.com/tetenifeme/fefopujujexoxatuvur.pdf
    • https://s3.amazonaws.com/vapite/47341012604.pdf
    • https://uploads.strikinglycdn.com/files/6632b1e0-57cb-4082-9e42-b724d2444541/wisalegukuzerunifola.pdf
    • https://uploads.strikinglycdn.com/files/713c127b-a1e5-429b-b97d-1204a4274d89/qual_o_significado_do_domingo_de_ramos.pdf
    • https://uploads.strikinglycdn.com/files/ff126da8-e11a-4eb0-b134-9f8de42cb166/61209270132.pdf
    • https://s3.amazonaws.com/bejexe/layout_border_radius_android.pdf
    • http://pejemevogoge.myartsonline.com/zikoguziwaruturafonesoti.pdf
    • https://s3.amazonaws.com/zagapaxa/bangla_new_movie_2018_link.pdf
    • 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_off00016d77.bin
0cce3cf68c3691d41a18bb7148e1f0bf0ad49191d9d5e80982d40622a32b6a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D77 5168 bytes
font_01_sfnt_off00017ef1.bin
ffbea3ec351efd6fd4c96aee82c39e69038dcf8ffe26fd2e758582d1ee28a50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17EF1 11188 bytes

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