Malicious PDF — malware analysis report

Static analysis result for SHA-256 84187699a84210a7…

MALICIOUS

PDF

73.8 KB Created: 2021-03-17 08:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d96fb79b609b6b37e58f234b44d1a467 SHA-1: 73b794d8d3618545f36e0036f7746cf9185b1078 SHA-256: 84187699a84210a79b40ad217df7ceb4ce040e309e62602a8209de8e0ffecf70
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 it is likely a phishing or trojan distribution attempt. The PDF contains numerous external links, many pointing to domains associated with link farms, suggesting an attempt to direct users to malicious content or further phishing sites. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the primary goal is to redirect users through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=thermal+fuse+dryer+location
    • https://cdn.sqhk.co/fuludasowipu/ihhgP9t/97160054979.pdf
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5fd82dae9e4ed.pdf
    • https://tokarakuwo.weebly.com/uploads/1/3/0/9/130969339/1307715.pdf
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6021a386049d4.pdf
    • https://cdn-cms.f-static.net/uploads/4413967/normal_60100a3f0fff6.pdf
    • https://cdn.sqhk.co/sixitigoxeto/gIhejgi/53330160748.pdf
    • https://static.s123-cdn-static.com/uploads/4446784/normal_5fcacd401f276.pdf
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fe3f224d385a.pdf
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/3989637.pdf
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/bezejupu_xenapexijija_wixajud_xebefix.pdf
    • https://fazebepipetuko.weebly.com/uploads/1/3/1/3/131384618/nojimaruwub_vifivuwim.pdf
    • https://cdn-cms.f-static.net/uploads/4424040/normal_600fb94b6d7a7.pdf
    • https://cdn-cms.f-static.net/uploads/4486763/normal_604146d0646ec.pdf
    • https://cdn-cms.f-static.net/uploads/4477162/normal_60516410152f9.pdf
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/bobanumubegifem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/61a7fd99-6121-4fcb-879d-85e4d6570b8e/folk_music_english_paragraph.pdf
    • https://s3.amazonaws.com/sixenogafopoj/twitter_gif_er_bot.pdf
    • https://s3.amazonaws.com/sebunuzu/avensis_2002_t0_2007_manual.pdf
    • https://uploads.strikinglycdn.com/files/e10bc057-c5ba-4a56-873c-43d595c7ca74/american_megatrends_please_enter_setup_to_recover_bios_settings.pdf
    • https://s3.amazonaws.com/pizivurapab/11414777451.pdf
    • https://s3.amazonaws.com/libeganot/genuw.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_off0000e617.bin
082a5211b16b79625e96d80090844373832c405a5cabf65ad5f12d81d02b758a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 5312 bytes
font_01_sfnt_off0000f803.bin
654232ce70736bf306f3010392a884c871b3b48235d62a0e6f6446f62836e839		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 10020 bytes

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