Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bca97be6bb2697…

MALICIOUS

PDF

82.7 KB Created: 2021-01-12 05:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8bd5cdcec86e12410918b94106a2ffea SHA-1: b6b621f2e0cf55b5ddb2c8c16cc1e74e3ac4b9dc SHA-256: 39bca97be6bb2697584cf141e9d25d577c39b38c37ad6d863873d9294d16bce7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or redirection strategy, likely to distribute further malicious content or phish users.

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
  • 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.
  • 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://traffmen.ru/123?utm_term=wellness+self+management+program In PDF document text
    • https://cdn.sqhk.co/sarowojep/giigf2k/78935758613.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/ijhe4if/recherche_nom_plante_vertes_interieur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5fdb13b6eda1d.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/wefabetesiwa-vexipovaxoki.pdfIn PDF document text
    • https://site-1205734.mozfiles.com/files/1205734/fugebiwabuvug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5f98831e5e055.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/xYRwxih/grand_theft_auto_6_trailer_official.pdfIn PDF document text
    • https://cdn.sqhk.co/pujigaloruri/idEJkDb/wejuvijojapitiloduro.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/eiebVjb/jixukoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/WzFMjcr/benanenubasijidiloxaxa.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/novifamigot/dreamscene_activator_windows_7_64-_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/xeravesopazepukon.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/topic_for_english_essay_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/church_of_pentecost_theme_songs.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_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 5236 bytes
SHA-256: 23f9b711294c47fa8ac5793d8b5c858179ba078d31e051f7eb080eb6db25aa94
font_01_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 10388 bytes
SHA-256: ac2da6bdbe34fa84320d05c48565a3e16662fa512a911c7f528812111f2b256e

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