Malicious PDF — malware analysis report

Static analysis result for SHA-256 acad827eff249d7d…

MALICIOUS

PDF

69.4 KB Created: 2021-06-08 05:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d15d725c83026db3252cd611e84d7c94 SHA-1: b066aeef18253f0aa1a7b09e9072631c7f4fa864 SHA-256: acad827eff249d7db940073566ac26e039da83c6971d79ad4d65d86df9e0fd45
126 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 0.9998

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 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://crewmak.ru/pbw?utm_term=how+to+adjust+brightness+and+contrast+in+pdf PDF link annotation
    • https://farerobizu.weebly.com/uploads/1/3/7/5/137500523/1047759.pdfIn PDF document text
    • https://vapulorefemefiz.weebly.com/uploads/1/3/5/9/135956910/jusikoxabinokero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevojoluvu.pbworks.com/f/28630497231.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144426972/dina_thanthi_news_paper_today_free_download.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/w/file/fetch/144627210/43248311193.pdfIn PDF document text
    • http://pikalunik.pbworks.com/w/file/fetch/144740280/sat_dec_2018_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c17469-e410-4fc6-bd3e-bdb0205c4a73/9772151242.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144826416/prentice_hall_algebra_1_online_textbook_free.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/xesebulotunusuwoniv.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/62501512856.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/deweratumogotup.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/96774679863.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/96994638333.pdfIn PDF document text
    • http://vamafob.pbworks.com/f/peseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298643b7-f072-4ac7-abe7-f3c00eba0a01/how_much_does_graphic_design_school_cost.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/w/file/fetch/144829353/oxford_handbook_of_clinical_pharmacy_download.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/w/file/fetch/144503817/nugaguvumeb.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_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 5656 bytes
SHA-256: 216a20ce54fc11fcf6c26d3a0e0c6055d9940c1ab99a871cd5eb51d90a076789
font_01_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 11536 bytes
SHA-256: f4c56d8b8d4f6155e6dbdb5167d0da5a5801e61bac1479a567a32bb499ec66bb