Malicious PDF — malware analysis report

Static analysis result for SHA-256 c857640d60a89162…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 19:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83a23000761bcdb5503fce839d9ce82f SHA-1: 3cd61f300e3c7a2cd70877ea7f78c169a4895cc2 SHA-256: c857640d60a8916273a7404d68bb49914ef7ea0bca365d6fe570548e93843234
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm designed to manipulate search engine results or direct users to 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 URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=paul+petscop+twitter
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/f0e4cee8c52716.pdf
    • https://cdn-cms.f-static.net/uploads/4391308/normal_603e37c299edc.pdf
    • https://cdn-cms.f-static.net/uploads/4366020/normal_60392a5fa92d8.pdf
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/2c7065ea47fcb2b.pdf
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fe289fe2f903.pdf
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/2070768.pdf
    • https://static.s123-cdn-static.com/uploads/4480173/normal_600622d335582.pdf
    • https://jugotogosef.weebly.com/uploads/1/3/0/8/130814460/3425622.pdf
    • https://dobeluxujopi.weebly.com/uploads/1/3/0/7/130775615/8173567.pdf
    • https://cdn-cms.f-static.net/uploads/4369322/normal_601736887bf97.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60461d02951e7.pdf
    • https://cdn-cms.f-static.net/uploads/4465930/normal_601f179602da2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6992a91-2445-4441-85bc-c9cc005ad992/60773191827.pdf
    • http://jogufek.epizy.com/clash_of_clans_server_ios.pdf
    • http://sifefelemab.epizy.com/resuscitated_hope_piano_sheet_music.pdf
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_78cf2caf202e4069b43b7a38bd6525be.pdf?index=true
    • http://bedegotix.epizy.com/zopojazelujadoluzepizova.pdf
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_2779b668c9a74f21b135e68d6b5e5932.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f560ea40-bba2-4361-9681-d1a5fb51e230/how_to_reset_yale_lock_to_factory_settings.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_off0000f2f4.bin
491e7444e2e38cfdbd1f083507289a174fe3f0468520a024b733618d498d811c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5020 bytes
font_01_sfnt_off00010427.bin
e2822ce7979826487f32a0f7cccf1e8f7c58391d8e4a39ff05ea8b4b9e6c4e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 11356 bytes

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