Malicious PDF — malware analysis report

Static analysis result for SHA-256 738c9c2f32b77496…

MALICIOUS

PDF

70.8 KB Created: 2020-12-04 02:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05817c706f01d9d2c06b7ca5cfa3e6fd SHA-1: 12ff8dbe2fdc2f14ab21ac496f7c8a2f70000831 SHA-256: 738c9c2f32b77496293c9535654d1316cd917b8f60115b58422b53a84f1036e4
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to harmful content or facilitate further infection, aligning with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://ggtraff.ru/123?utm_term=sims+4+cheat+engine+aspiration+points
    • https://kajurizekevebok.weebly.com/uploads/1/3/4/5/134586758/3d8f45c9a2f.pdf
    • https://cdn-cms.f-static.net/uploads/4489045/normal_5fb31d6112512.pdf
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/puruzejo.pdf
    • https://molipexizeji.weebly.com/uploads/1/3/4/6/134693273/a34e7aeb.pdf
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/8253730.pdf
    • https://cdn-cms.f-static.net/uploads/4447914/normal_5fac213b805c5.pdf
    • https://mapizijef.weebly.com/uploads/1/3/4/4/134493838/fopefulevovoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jamokaroxoj/manual_ide_eclipse_espaol.pdf
    • https://s3.amazonaws.com/mokuwanibof/que_son_las_reformas_borbonicas.pdf
    • https://static1.squarespace.com/static/5fc13a23affbf90a66eca3c4/t/5fc96b8019890c408b1e096f/1607035788486/background_remover_photoshop_action_free_download.pdf
    • https://s3.amazonaws.com/jarirotexab/ccleaner_apk_for_pc_free.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0ad8b7a66e04eaf6d79a/1606224603457/17249718170.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c0.bin
0fdc8721b6c29c047a44a8b0a575e642863557b1715c5c81ba0f4889468b76de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 5504 bytes
font_01_sfnt_off0000e95b.bin
1fbeee24f9da6f715fffee2c38cfa01b8ad3219c17594e76bca8277108257875		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 10940 bytes

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