Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fb392c1fdf40c8…

MALICIOUS

PDF

72.0 KB Created: 2021-05-05 20:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef2c4f17131f5dcdf8b4299de80786c SHA-1: 2edd3982a11b4ec85871c58aaff0173b400c5c65 SHA-256: 81fb392c1fdf40c8cbd0f22722556782c64bb42a0e31698cf58e0a9b7395fe59
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm or redirection scheme. The document body, though heavily obfuscated, contains what appears to be a search query related to vehicle specifications, suggesting a lure to disguise the malicious intent. The presence of multiple PDF_URI and PDF_SEO_LINK_FARM heuristics strongly suggests this document is designed to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=what+is+the+gvwr+of+an+international+4300
    • https://cdn.sqhk.co/muvasesuru/ifokHgj/26464589069.pdf
    • https://cdn.sqhk.co/telapunojawu/hdRAe4K/19966323991.pdf
    • https://cdn.sqhk.co/kenujowemi/ifjdigk/download_repost_for_instagram_regrann.pdf
    • https://cdn.sqhk.co/pigevikuwi/Bjd05Ts/balapozupigogogaxejazexi.pdf
    • https://cdn.sqhk.co/palugalanivo/kjcHgdD/any_video_converter_free_cnet.pdf
    • https://cdn.sqhk.co/gujipiror/gghdii0/tesis_descriptiva_correlacional.pdf
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/vipesuwupixu.pdf
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/8506407.pdf
    • https://cdn.sqhk.co/merabuvi/hhLqQha/final_fantasy_iv_the_complete_collection_psp_walkthrough.pdf
    • https://cdn.sqhk.co/vawadawuleja/Dig2hfj/test_drive_unlimited_download_free_mac.pdf
    • https://regujimupakuve.weebly.com/uploads/1/3/5/3/135348903/bejuvirarunimus_rivafepanijon.pdf
    • https://cdn.sqhk.co/zimopaji/gd7jhXe/xelimajuteronez.pdf
    • https://cdn.sqhk.co/toxinize/4Oiiij2/28392868252.pdf
    • https://cdn.sqhk.co/runetonorox/igsKLij/restaurant_story_appliances_recipes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pukaridimupo/gesovepozawoki.pdf
    • https://s3.amazonaws.com/jivamubug/xudeto.pdf
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_b410b668a8a6457786b01bf0e19f78a7.pdf?index=true
    • https://s3.amazonaws.com/zaxuledo/java_spring_rest_api_template.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_1f5f1141aa40487aa4af06d114f4a327.pdf?index=true
    • 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_off0000d96f.bin
3200ac15829c9943037aadd88f1d9a46e3da776b7403db36e2aaa5001274c660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 5588 bytes
font_01_sfnt_off0000ec8b.bin
43d6999865d619bb9cfa99c8d3be0b54fd24a77e832be02f55cce5e2ea5af2ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 11228 bytes

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