Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f34e01747d123c7…

MALICIOUS

PDF

108.4 KB Created: 2021-01-10 09:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 881c2a6df19ae711554b7f6c6f8929af SHA-1: 00a751ee675dd75e3e5164d675ec48051b0ff50c SHA-256: 8f34e01747d123c7e579b0ed890f072faec7e000dd5eb17d5bc94e3672e576b5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to various external sites. One of these links points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=building+information+modelling%2528+bim%2529 In PDF document text
    • https://cdn.sqhk.co/ruwonumatag/gchcDhg/don_t_you_dare_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/mulepava/ijjeYoR/vafiluvupabogavega.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/lawezejelefi-wanare.pdfIn PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/04c8d61747.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/fheerlY/marktplaats_bv_contact.pdfIn PDF document text
    • https://bowutemol.weebly.com/uploads/1/3/4/2/134234741/madamariseg.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/vemakebojutig-luwugofusuvena-toxiritinixo-bakuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_5fa5f656036a1.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/e9jcPqU/retroarch_ps2_bios_files.pdfIn PDF document text
    • https://xedawazusaxe.weebly.com/uploads/1/3/2/3/132303108/sepixexeputaditibo.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/Ohdggjj/should_i_homeschool_my_child_with_adhd.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/haridW2/rollercoaster_rush_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00016a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A24 5392 bytes
SHA-256: 635e343927851c59364af6b9ec58411a5ec08d17762c42a629bc54e053aea4cb
font_01_sfnt_off00017c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C72 12612 bytes
SHA-256: 00c5982482856e224dc6ffe67655dd0927740eab8ab0909a4db3d3ceb61c0a10

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