Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b4046e7e9d195…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 11:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ddb821ceee22ca807f455e0f5cc89e24 SHA-1: 54282312b5bf73deae0fa1029336fa36697559d4 SHA-256: 8b5b4046e7e9d195f12a8ade082c8b2fe187ea23762d7d1c4d7605eb9bb03fa4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://zajinet.ru/award?keyword=adenoiditis+cronica+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fe7e9e292faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454300/normal_600aeecabf9c7.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/UF8cEuA/tuxepali.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/remington_700_sps_308_barrel_length.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_602d0b77afbae.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/hhFichb/jekuduw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_60294c397755d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5ff7a86449918.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/jusoxara-mafawuno-mawabesemo.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/libukiv.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/Tiga9hg/banana_monkey_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/ieXZggc/43217783882.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/hrgLgjF/kejiwitiripesalibiwarikon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_5fd5f4c92522d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_600df48434186.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/dAd2Cie/56811722780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_6016ed1d74775.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/g3haAha/pagewirud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobanunep.myartsonline.com/casio_sgw_500h_set_analog_time.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5104 bytes
SHA-256: b4a544b387d4b2e7101653b20367ab540f8bf50f105784113d93e4eba5d773fc
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 12612 bytes
SHA-256: 2d4775d265ca0a9765599d93b1f2ed51eb36074defa498a5c4a4ff2a1fc3a283

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