Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0761046728ce31…

MALICIOUS

PDF

83.2 KB Created: 2021-03-21 05:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2633d8344e3aeae76d4494b4f36c8bf8 SHA-1: 135f13884bea11bb7c94bdcf83ed1e839a082bda SHA-256: 1b0761046728ce318f15abb41f53e189d9443f35da9627b442e6bda2d70d84e1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious or spam content. The primary attack vector appears to be luring users to external sites via a phishing or SEO spam technique.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=bach+prelude+in+c+major+pdf+guitar
    • http://tesojopilolav.22web.org/fujovepoxiwo.pdf
    • http://datingdate.site/zenenepebalezi5l26.pdf
    • http://raisinslabs.club/iso_9001_certification_company_search8qxxu.pdf
    • http://urro-hu.com/acer_aspire_v17_nitro_bios_button3cyvc.pdf
    • http://help-copyrighteamservice.com/58841038228dzshz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://toxalotivip.epizy.com/frutas_y_verduras_en_ingles_con_pronunciacion.pdf
    • https://uploads.strikinglycdn.com/files/a5dfb21f-45aa-42fb-8c9b-953b347656d9/setax.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_203617b5de22430e9b9546d2d887b044.pdf?index=true
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_5297b70031a343718aacf26b2f12044b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d49f4ff1-9349-4151-a9a2-3b48e0eb7c29/gituworugokaxigufer.pdf
    • https://uploads.strikinglycdn.com/files/7aa813dc-6ba0-4c52-9fb3-cb0d2750fbda/zemudusuzasebur.pdf
    • https://uploads.strikinglycdn.com/files/f3fd3a8d-8ffa-4312-b768-27c7893be778/free_maths_for_7_year_olds_uk.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_35efcc19efa042a5bd48b0d91398a9cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ff64922b-f409-4e95-988c-0683ce293d0d/55333876902.pdf
    • https://uploads.strikinglycdn.com/files/645a6c8c-5284-4d8b-8732-81efb3166444/digisamijuweg.pdf
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_975f92495ecb4cea836c5fca7a8304f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8c5160a5-8665-430e-97a3-9bc24e761e3e/viva_el_toro_book_in_english.pdf
    • http://vepawipexujobok.epizy.com/1615082033.pdf
    • https://uploads.strikinglycdn.com/files/858acc4f-03ba-4522-9ee7-8c58a0f1be3d/9075640886.pdf
    • http://salekisaju.epizy.com/81170971691.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d9.bin
92600f7edd84bf89df62dd56fd00a0d03e9c342d3875473a21e2aada9e4e8bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 5400 bytes
font_01_sfnt_off00010703.bin
f173b06dbb983ea32a2f2239c5984effd3828707ce4dd07e021426634dc3dcf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 12588 bytes
font_02_sfnt_off0001313a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 4324 bytes

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