Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6a462e1086e75f…

MALICIOUS

PDF

75.8 KB Created: 2021-03-26 10:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7973ade2ae862f3d2a3c354503dca707 SHA-1: af0cd1c71c72c377ee8cdaabc1b17008c44c56c4 SHA-256: 0b6a462e1086e75f8afa02e8020b35247dabcb9746c0d70a5f8eb52a1cdbcd37
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely serving as a lure to external malicious content.

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://jottigo.ru/strik?utm_term=why+structure+is+important+in+writing PDF link annotation
    • https://cdn.sqhk.co/ragejeli/O0gf8ih/baviwujikitoma.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/fciftjh/rabekizirezo.pdfIn PDF document text
    • http://fimufajupasi.22web.org/lujigi.pdfIn PDF document text
    • http://wulixiv.sportsontheweb.net/buddhistische_lehre.pdfIn PDF document text
    • http://mukosejak.iblogger.org/varareno.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/jSWjeib/unique_retro_fridge_home_depot.pdfIn PDF document text
    • http://zafibekimov.22web.org/11757063864.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/d8DpeOk/live_love_wallpaper_hd_app_download.pdfIn PDF document text
    • http://keripudatoxene.iblogger.org/xigixutuvebikojoravik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6da5da70-f600-4717-8854-f97f87920159/learn_spoken_hindi_online_free_through_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec876e2-5be5-493d-8b5a-3623c93cc485/43665480892.pdfIn PDF document text
    • http://jagixav.rf.gd/terokojupovow.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/fenavijixozokufezimumo.pdfIn PDF document text
    • http://nunozufivov.epizy.com/wokijotemiruko.pdfIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/26727513466.pdfIn PDF document text
    • http://sunulenebesug.rf.gd/english_grammar_class_12_up_board.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 5404 bytes
SHA-256: 1d6209cc2a4fb08461a42b44cf8d3a643bd54cc09bab7d177fdac102166ea10d
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10512 bytes
SHA-256: ef3fa9b37083dd720c243caba1130ea9736f51e8f8ea0eb39ebe4bb37f5516c2
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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