Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ab8b322c00c82d…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 14:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: c940b9265cd34c8b3f08ccc0e155eb41 SHA-1: 5fd1f9e4fe4e817abc31529df652ad7ce4e2c86d SHA-256: 42ab8b322c00c82d84956038edb418dee2e70be05caa612e5f48a0c4da0d46b5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious or deceptive content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=texas+cdl+training+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484631/normal_5fd8132e4be48.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/sibijegumiveva.pdfIn PDF document text
    • http://mpvideo.org/are_lever_guns_reliable0frqa.pdfIn PDF document text
    • https://titamifafipife.weebly.com/uploads/1/3/4/3/134315234/fekegiwej_bixelezaremo_sevuxavilofiw.pdfIn PDF document text
    • https://vopilexazum.weebly.com/uploads/1/3/2/7/132740267/wiravefe_xobuwab.pdfIn PDF document text
    • https://nifebupamej.weebly.com/uploads/1/3/1/6/131607321/e3a3ab0fbaf4ae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403674/normal_5fef4475b813d.pdfIn PDF document text
    • http://mifvideo.space/70985931619fq7q9.pdfIn PDF document text
    • http://deflecfcvy.best/employee_engagement_project_report_for_mbas7dlh.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/xuruwopuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_6001802e0f01a.pdfIn PDF document text
    • http://kukushpa.fun/pijinixewodebivakujebisus0jdk5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/hacked_android_games_coc.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/narrative_writing_topics_for_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/vertex_shader_3._0_intel_graphics.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 5124 bytes
SHA-256: 551d5bc668c3c8034d6cd8960f81bdbb1fce039ada257e7eb915b81b213ae652
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 11224 bytes
SHA-256: 033f299800e9e38f6202cd56b925f6e4a58271734ea39286c58b0b6d760323bd

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