Malicious PDF — malware analysis report

Static analysis result for SHA-256 3877a4bbdc35e003…

MALICIOUS

PDF

83.8 KB Created: 2021-03-10 12:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55a92168b2076cdb8d316ffd30422965 SHA-1: 01850c1d993da553500f1b2d0550692a04996886 SHA-256: 3877a4bbdc35e00360600d2a43e4f2765361be7fe92c1e74d81ae48d901b5e39
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=askep+faringitis+pdf
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fcbe0b342e40.pdf
    • http://xenuven.22web.org/mowipotetiw.pdf
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/4f1cc2b4ecf1885.pdf
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ffc4eb2c968a.pdf
    • http://nuvemibopakukot.22web.org/36688188650.pdf
    • https://static.s123-cdn-static.com/uploads/4454289/normal_60018d097b0cc.pdf
    • https://cdn-cms.f-static.net/uploads/4459328/normal_6016a53d4ef29.pdf
    • https://cdn-cms.f-static.net/uploads/4446502/normal_603955ec5cac6.pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_600a0bf87632c.pdf
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/vupenexakeg.pdf
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/1488616.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nixevafuzija.epizy.com/balancing_word_equations_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/fb5203af-b0c0-4187-8262-6027b4882a0c/33315191376.pdf
    • https://uploads.strikinglycdn.com/files/5c5ba8f0-2644-4cf4-88d6-3dc594a8ff86/49218234660.pdf
    • https://uploads.strikinglycdn.com/files/577b7806-b748-4853-9a65-78860a012c0a/carrier_weathermaker_9200_flame_rollout_switch_reset.pdf
    • https://uploads.strikinglycdn.com/files/d4f41dfa-f7b7-46b6-8f88-e08a783f99e7/roxilefil.pdf
    • https://uploads.strikinglycdn.com/files/7069aeb6-955b-424f-b5dd-e6cec72e9522/how_to_make_a_good_balsa_wood_bridge.pdf
    • http://zujewutaze.epizy.com/how_to_set_up_diaper_genie_complete.pdf
    • https://uploads.strikinglycdn.com/files/4beda9a9-5ffb-46f8-a72d-c8232303aa32/lirr_atlantic_terminal_to_ronkonkoma.pdf
    • http://nanolato.rf.gd/nero_burning_rom_2015_crack.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_off00010d33.bin
04cb45e1dc15a5d3fcd2ab90799aaf6defbe38e0ed5300c560fb659aa72d0ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 5232 bytes
font_01_sfnt_off00011f17.bin
be61272f69ad2607ceab02d03ccdf492e69c71be52adcf607b5cd542a9d1b38e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 10196 bytes

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