Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b3e179d32b95eb…

MALICIOUS

PDF

87.3 KB Created: 2021-02-19 10:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0b041513230920b11ac544f28c71f10 SHA-1: d5dab5a1ed76b9751ae747500eba738897fcb3c5 SHA-256: b3b3e179d32b95eba3a2fa05422ca82944fdc55b73de8cc72127b2f11048b0f2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, including one pointing to 'jacksth.ru', suggesting it's designed to redirect users to potentially harmful content or phishing sites. The PDF's structure and content indicate it's part of a larger SEO spam or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/wix?keyword=inverter+direct+drive+washing+machine+cl PDF link annotation
    • https://cdn.sqhk.co/muvetowiripa/thdEBig/62810849228.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/3425055.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/ixhgnr3/facebook_lite_vs_facebook_app.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/3284850.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/novudifek.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/398947.pdfIn PDF document text
    • https://zuxorubijif.weebly.com/uploads/1/3/2/6/132695980/9388934.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/4285018.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/cifPzhd/download_dragon_mania_legends_cheat_mod_apk.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/461950.pdfIn PDF document text
    • https://mumotajesok.weebly.com/uploads/1/3/0/7/130738730/temuzudifo_dajalimejo_kidipinerizo.pdfIn PDF document text
    • https://zomuguwiremadak.weebly.com/uploads/1/3/1/4/131406071/ruwezozanev.pdfIn PDF document text
    • https://xugowapowafav.weebly.com/uploads/1/3/0/7/130775127/47b4f8de20eb.pdfIn PDF document text
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/7767630.pdfIn PDF document text
    • https://gebusoju.weebly.com/uploads/1/3/0/9/130969184/susiji-valufubeba.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/66dc6e62fbebb8.pdfIn PDF document text
    • https://gofolonuk.weebly.com/uploads/1/3/4/3/134313710/8379585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mowigefugitixa.epizy.com/vivupovomenuzazikigovidu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 5440 bytes
SHA-256: 05210047ef6c2ca769d0bcca29ee385314780ed26cdb792b6b8d30a5e9357e84
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10564 bytes
SHA-256: af9d11aaf9e8db656f2486712746e2441935a864cc1685d0901a6f956d94258e
font_02_sfnt_off00013a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 16148 bytes
SHA-256: dbe1f6873dfbc63a557840fa26764ed1e24daf10180a919a5f50e881975b6f06

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