Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dc31b046e5a871…

MALICIOUS

PDF

106.1 KB Created: 2021-03-27 22:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 28e60a0b03c81c7356acbc1a565c42be SHA-1: dec9142b3114e19ee28b9888e0f2ae7a138d41cd SHA-256: 58dc31b046e5a8717d8085878658ffd00c84afe07f7282db06dd978c45eb0d01
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for SEO spam or phishing. The embedded URLs point to various seemingly unrelated topics like catalogs, book releases, and training schedules, likely to attract a wide audience.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/award?keyword=catalogo+ngk+pdf+mexico PDF link annotation
    • https://cdn.sqhk.co/febowozefu/rggihE5/bravelands_book_5_release_date.pdfIn PDF document text
    • https://zeruxitewisav.weebly.com/uploads/1/3/1/8/131856065/bomexudijot.pdfIn PDF document text
    • https://volifutizur.weebly.com/uploads/1/3/4/6/134602954/9677977.pdfIn PDF document text
    • https://wusoditada.weebly.com/uploads/1/3/1/4/131406121/176a1c.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/podokav.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/functions_of_project_management.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/3003707.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/fgfihaj/nintendo_switch_black_friday_price_2020_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/milatepoz/c48ifMC/sonic_4_episode_1_cheats_ios.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/7990097656.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/7ncSaHN/87560495919.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/linexi_teduwizevusine.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/3395847.pdfIn PDF document text
    • https://dabomisefeb.weebly.com/uploads/1/3/0/7/130775205/dofufanejuwikosesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://situwosase.myartsonline.com/stress_relief_at_work.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/yearly_training_schedule_template_excel.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/xeduxinerifebofonu.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/68082086121.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/equations_involving_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/fojixiwabesawonewirog.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_off00015da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA4 5236 bytes
SHA-256: 433bb4de4ec0b7ad65b2552423138cf228bc3ca76b017146287de58113f31ade
font_01_sfnt_off00016f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F70 13100 bytes
SHA-256: c54be6c06754dd0362db628d174157c227ef2567afa438a5a8c9e70aaeaf970b

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