Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed2353b3f7d930d…

MALICIOUS

PDF

82.3 KB Created: 2021-05-18 01:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da94dec8f6449401413ece3ff78cd456 SHA-1: c5be60409f16a1a4a9d60697a54d3e260d7bf3ec SHA-256: 9ed2353b3f7d930d6bfb05a939fd8e3bfbef668296dac4437d5c5b09906d4b71
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host multiple PDF files. One of the primary external URIs points to a suspicious domain, likely serving as a lure for malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://xajibur.ru/strik?utm_term=examenes+biologia+3+eso+resueltos+oxford
    • https://mebolosedam.weebly.com/uploads/1/3/6/0/136009811/2191446.pdf
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/golifoneni.pdf
    • https://vuvopovakufusoz.weebly.com/uploads/1/3/4/3/134342968/sijakizogajife-lekuwaxaxebozat-pobiw-fifobenat.pdf
    • http://fikunigogijori.22web.org/zosobawivitag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nilafafakem/what_is_electrical_system_in_automobile.pdf
    • https://s3.amazonaws.com/sesafefanulokam/42305478836.pdf
    • https://uploads.strikinglycdn.com/files/aa572b13-135a-44a1-b157-d227d161ba32/hajj_rules_2021.pdf
    • https://s3.amazonaws.com/gomaxod/python_online_training_classes.pdf
    • https://s3.amazonaws.com/gebukil/76413664264.pdf
    • https://s3.amazonaws.com/xedewofuretujo/6722859619.pdf
    • http://wizomavo.epizy.com/tan_delta_test_of_transformer_bushing.pdf
    • https://s3.amazonaws.com/kitakilesa/dell_precision_t7500_bios_settings.pdf
    • http://naxilolebepup.epizy.com/piletemariwatesulo.pdf
    • http://nilikejavovop.rf.gd/uc_browser_java_versi_9._5.pdf
    • https://uploads.strikinglycdn.com/files/93146049-9d1c-409b-94d7-ea6a4386299d/xotadefudeb.pdf
    • http://zafipuzekamezu.epizy.com/ruzagurukimomunabosus.pdf
    • http://bolozenafo.rf.gd/great_gatsby_chapter_7.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/agile_software_development_principles_patterns_and_practices_github.pdf
    • https://s3.amazonaws.com/sitok/98736850994.pdf
    • https://uploads.strikinglycdn.com/files/878de32d-5007-4f3e-835e-84aa34bc371f/vadirirerimu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0c.bin
8a560871c717effd8d044d423251fbab267f3e9458873045b3dc1d319b3ceaab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 5556 bytes
font_01_sfnt_off0000fce3.bin
a450bc46008c8171793ffebc1d201421c46174042a62d739a133e0fd42dcaec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 12260 bytes
font_02_sfnt_off000124d1.bin
d286e8b4d1cdafc5f769987bdccf7a6368ad55d0d3b8f98fd56bc2ae223999f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16076 bytes

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