Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3a7d3ed5299b95…

MALICIOUS

PDF

75.5 KB Created: 2021-05-22 18:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d817bbef816dec51618ff3149769a9b SHA-1: 999ad65c4a0a8d52ed2262f82dd4a9fce60bd1f6 SHA-256: 8f3a7d3ed5299b95310563b838901e7654bbbf3cf9b239eda3bdec4a86ca1178
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=adobe+photoshop+7.0+free+download+for+pc+with+key', is presented in a way that suggests it leads to a software download, likely a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or potentially unwanted software distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/strik?utm_term=adobe+photoshop+7.0+free+download+for+pc+with+key
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/butovazit-kixemokomatew.pdf
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/096ee9fd6a.pdf
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/jeresunalirepove.pdf
    • https://givebuzuwipagin.weebly.com/uploads/1/3/0/7/130775776/vidasugofam-siwadoturexalor-texidi-rarorakegete.pdf
    • https://cdn-cms.f-static.net/uploads/4444882/normal_6067caef01830.pdf
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/bedekerexelofom-mebitikidufekev-jiluleti-dozajukodov.pdf
    • https://fafapiponuge.weebly.com/uploads/1/3/4/6/134692005/f1ed1b78f4.pdf
    • https://static.s123-cdn-static.com/uploads/4427793/normal_6005584bc62dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/falevi/burma_map.pdf
    • https://s3.amazonaws.com/votubukaxogilix/aikido_aikikai_techniques.pdf
    • https://s3.amazonaws.com/bisegilupuf/58671658359.pdf
    • https://uploads.strikinglycdn.com/files/91744550-2b08-402a-a23d-e83527a94786/all_american_canner.pdf
    • https://uploads.strikinglycdn.com/files/4f61017f-12e0-4d0f-98ef-56fc65028637/how_to_clean_whirlpool_duet_washer_dispenser.pdf
    • https://s3.amazonaws.com/bufipevuril/pufivomixolotonofofemomeb.pdf
    • https://uploads.strikinglycdn.com/files/ada2f116-6c96-4202-aeaa-89d92d776716/jaduvo.pdf
    • https://uploads.strikinglycdn.com/files/92fb6727-8357-485c-93be-7bd0a61fddaf/50_writing_tools_roy_peter_clark.pdf
    • https://s3.amazonaws.com/nuxomigo/holy_bible_online_free_no.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_off0000ea09.bin
bf406ee701e2d3a970dbf896ae923d4dcef872b94158253913b81fd9b12bf3cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 5884 bytes
font_01_sfnt_off0000fe31.bin
8a10bd700502c8282b09926f2696c4117b5121e3a5c2375c1cdb7015e9f97ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 10104 bytes

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