Malicious PDF — malware analysis report

Static analysis result for SHA-256 df67b2ec50dfb162…

MALICIOUS

PDF

74.2 KB Created: 2021-02-11 22:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bff3108ad4fdfa2eb34ae3751be783ef SHA-1: 8e8203cb0c1a0970b044aa1bfe804ebff0bfbbe7 SHA-256: df67b2ec50dfb162577db9ff0c141b8bd43f3e166f4373303c684dd4c914db9a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL being 'https://leonvi.ru/wix?keyword=games+images+4k'. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a phishing or spamming campaign. Although no scripts were explicitly extracted, the PDF structure and the nature of the links point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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
  • 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://leonvi.ru/wix?keyword=games+images+4k
    • https://cdn-cms.f-static.net/uploads/4412763/normal_600c68dfc7039.pdf
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6014c7f65a28e.pdf
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fd61eecc98ba.pdf
    • https://xaxepilote.weebly.com/uploads/1/3/4/2/134265473/mepurizobaxaxog_siribugorejuwev_pofatopilawusox.pdf
    • https://cdn-cms.f-static.net/uploads/4471959/normal_60171c4036575.pdf
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/pibazi_damoleros_kuwitazagilejum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pivetuzadujo/sales_contract_terms_and_conditions_template.pdf
    • http://nofadokar.rf.gd/android_tv_box_review_cnet.pdf
    • http://jitimixilu.epizy.com/wilton_party_cake_cutting_guide.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_off0000e974.bin
5d9d3f34018db4c2dba785d770b2dab0533c15ae75eb35463496d569cba4cb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 5060 bytes
font_01_sfnt_off0000faad.bin
cee4db67a5e63f38b5861209caa7a41fb97588c60f9c7cbe581d7e749a0b2e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 9936 bytes

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