Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ccf79fb6318b59…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 21:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b79e45dd039f25a37ffc2813541b371 SHA-1: 459272149312f70101bb1f975c3b5b3559c76c82 SHA-256: c5ccf79fb6318b5961414690652f80fd8185bf3dcf5f65633e3f71a95898ddad
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=how+to+ignore+a+guy+you+like+to+get+his+attention
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/afca2b6.pdf
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/jufumufinot.pdf
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/833327.pdf
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/cfa20d10a456d.pdf
    • https://xiramulume.weebly.com/uploads/1/3/2/6/132682542/4366819.pdf
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/lidobasiwuxakexudeka.pdf
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/fipebajuveg_sanifer_japav_gewon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_774c35f3765a40138fe47e494d7d6ce3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/312036bc-fc1b-4a0c-85e3-f6afe75ed359/sapatimori.pdf
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_99569a95f5a84413b65ead3b9892b2e0.pdf?index=true
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_194885e07ee1414c9576b5e0f272876a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c9be2bd-0fdc-47c3-a887-ae262c3ec491/fatigaxulifurasefobe.pdf
    • https://uploads.strikinglycdn.com/files/15e9483a-b7ef-48eb-bbc8-daa2d98d652d/easy_calculus_problems_and_answers.pdf
    • http://sesunofopum.epizy.com/how_to_program_my_vivitar_universal_remote.pdf
    • https://uploads.strikinglycdn.com/files/2ec3860d-7c7f-435c-9e8f-d3c6433e9ca2/wasakigarob.pdf
    • https://uploads.strikinglycdn.com/files/7618f70f-ce4a-4e19-9e21-bdb171921dd6/what_is_routing_in_mvc_interview_questions.pdf
    • http://negikapivipen.epizy.com/65593932422.pdf
    • https://uploads.strikinglycdn.com/files/ac4549d6-a654-4105-b006-f56220a11cf8/why_do_we_punish_ourselves_more_beautiful.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_bed9debb2c3c48bc880d51702297f4e6.pdf?index=true
    • http://jekopebajazitat.rf.gd/uud_1945_amandemen_terakhir.pdf
    • http://vogijub.rf.gd/95896309004.pdf
    • https://uploads.strikinglycdn.com/files/43a1ce0d-bf5d-45ac-af8d-58a3d9a8e676/64964595835.pdf
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_04dacecda1434cf5a5fd4795e486affe.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_off0000f7d8.bin
210121b33fd6513ce18b6d1987732ff2d8c1a5b159516e3a687c28880925e6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 5164 bytes
font_01_sfnt_off0001097a.bin
9cb5bc860e853454522dfabf6427a54518d54aa0fa82639cf82fc55e50ac8926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 10456 bytes

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