Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31dd00805b64450…

MALICIOUS

PDF

71.7 KB Created: 2021-02-14 11:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 17dc45f7ded9f9ddc8fb3982435c0d81 SHA-1: 9f6948e013d65ed28f5235512ce4b39573176691 SHA-256: f31dd00805b644500694ddca80fa8db6d6c0cee2459c259696557f31310e23b2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, indicative of a link farm or SEO spamming operation. One URL is identified as a malicious redirector, and ClamAV detected the file as a phishing trojan. While no scripts were extracted, the structure and URL distribution strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=fat+horse+painting In PDF document text
    • http://vabuzunaseridal.iblogger.org/chhota_bheem_kung_fu_dhamaka_720p.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/banaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fc9e8c068053.pdfIn PDF document text
    • https://sipebiwamedewor.weebly.com/uploads/1/3/4/7/134707389/tositezukad_masexuwifagu_bobej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fe5e8e09a689.pdfIn PDF document text
    • http://businessoutsourcing.org/lego_city_undercover_vehicle_guide256sw.pdfIn PDF document text
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/2588757.pdfIn PDF document text
    • http://begemotiks.fun/blade_2_android_apkp8r5g.pdfIn PDF document text
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/ravatezimoguf_jefoxulatumitel_bitodepugonetit.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/fexiba_nogel_wajabuvemar_mefet.pdfIn PDF document text
    • http://printnews.site/zokujotokolaxuwijaduziw5xliv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417814/normal_5ff8f4e495038.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
    • http://tirevotijo.epizy.com/tecnologias_de_la_informacion_en_ingles.pdfIn PDF document text
    • http://luvurukakun.epizy.com/manualidades_para_vender_esta_navidad.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/karavasigij.pdfIn PDF document text
    • http://zibemusisuvimal.rf.gd/production_and_applications_of_cellulose_nanomaterials.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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 4792 bytes
SHA-256: 81fb0803437e0621f7f40588521900b19a303b682a431ff6817f9ff2a9dd9230
font_01_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 11900 bytes
SHA-256: 87a2e4a4632787b3a9912adfd9a4fe4cd9975fc984437f9aca42351a26dba36a
font_02_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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