Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c59569e35b6bc4…

MALICIOUS

PDF

65.8 KB Created: 2021-03-31 13:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 51e6d153f0733da2df35f66d720280f7 SHA-1: 52ec18a2f5dda3275407ac9022ea2e6359029541 SHA-256: b3c59569e35b6bc4161b7e64c861e89e4e7c3108c8a3be0c93f95c5c867c62d7
156 Risk Score

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=andritz+pumps+catalogue+pdf PDF link annotation
    • https://cdn.sqhk.co/sixepatexup/gIyhbnZ/red_and_blue_make_purple_pink.pdfIn PDF document text
    • http://purpless.vip/muwopvy12y.pdfIn PDF document text
    • http://clebohets.xyz/pajopiferilinusohj58.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/cHK6MNc/sportage_extreme_offroad_drive_modern_sports_cars.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/6535502.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/1db0a2d.pdfIn PDF document text
    • https://nelejejo.weebly.com/uploads/1/3/4/8/134883178/wezuvonov.pdfIn PDF document text
    • http://mainsale.info/vizukijevivu1h4pe.pdfIn PDF document text
    • https://xotagolopotipik.weebly.com/uploads/1/3/4/7/134713968/3442379.pdfIn PDF document text
    • https://wowererifawop.weebly.com/uploads/1/3/1/3/131384429/lusukepupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/44307535762.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/tarepo.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/crosley_record_player_cd_won_play.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/mamilejizisopuvoledagubol.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/avira_antivirus_pro_offline_update.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/lamepuzumukudiberamejajov.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/36166365496.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/eliza_wasn_t_looking.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/mla_works_cited_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/sexalosadawavadus.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/how_to_use_trekking_pole_loops.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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 5512 bytes
SHA-256: 926c8d4013022a7fd8009f2ca596ec27f67a32ca362e5ff45d47d3c176cd88a1
font_01_sfnt_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 8956 bytes
SHA-256: 8a522b01d898c02daafdd40f9a2c097964d6557e044db9ef2fff5594b4dceaae

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