Malicious PDF — malware analysis report

Static analysis result for SHA-256 7009b3a3bc130b34…

MALICIOUS

PDF

81.0 KB Created: 2021-04-09 14:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4f87c757c9b46b6bf4abe75185d066f SHA-1: 26eed2a44a8c7d6049389d69bdbe084e9a36aa90 SHA-256: 7009b3a3bc130b3414c73bfad2dc7ddcc306a86e907b7a7c98faf52289ca4217
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The PDF contains a large number of external links, many pointing to other PDF files hosted on various platforms, suggesting a link farm or redirection strategy. The primary URL identified is https://nipisod.ru/strik?utm_term=silver+age+sentinels+character+sheet, which likely serves as an entry point to this network of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=silver+age+sentinels+character+sheet
    • https://cdn.sqhk.co/bilexodofose/hRgjRjg/10028089807.pdf
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/gowoxidonez_fofenim.pdf
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/nidedagunare.pdf
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/rotid-galomemadufexin-paxaxifuvipikev.pdf
    • https://cdn-cms.f-static.net/uploads/4411696/normal_6054ad1d3114a.pdf
    • https://rajotabew.weebly.com/uploads/1/3/4/3/134360909/d86ab9787c22.pdf
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/kufure.pdf
    • https://bamupenasod.weebly.com/uploads/1/3/1/4/131410012/nezufomajaruxux.pdf
    • https://cdn.sqhk.co/dimowitop/jgSiiWo/pizolexesefakefofono.pdf
    • https://cdn.sqhk.co/xororofomed/M9jhQS9/selling_on_etsy_in_texas.pdf
    • https://wevejabunom.weebly.com/uploads/1/3/1/4/131406075/46ee20.pdf
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/bobasonug.pdf
    • https://cdn.sqhk.co/vowibesep/bCNMjaM/xezobutigireropoxole.pdf
    • https://cdn.sqhk.co/vuzowadijavu/tgZiaje/checking_kplc_bill_via_mobile.pdf
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fcce50d924b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiwopusafize/favourite_things_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/fef828d1-9cf5-4041-bc5d-7c9ebcbedeb6/vizio_e701i-a3_weight.pdf
    • https://uploads.strikinglycdn.com/files/e0d16962-2cf8-4fa9-b438-3c7b1bce4186/how_much_is_infinix_note.pdf
    • https://s3.amazonaws.com/nuxulikiwab/90505416212.pdf
    • https://uploads.strikinglycdn.com/files/53ae00bf-a851-420f-b75b-c81db95fd80d/66945175720.pdf
    • https://uploads.strikinglycdn.com/files/52743576-8bda-46b7-a86e-4d2112b9a009/73409762097.pdf
    • https://s3.amazonaws.com/zidosozawok/kigogununarevisarip.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_off00010145.bin
7800e86d3d1694c68d8885e4a7a392bde5cddfc5dec3f3c4cfba030d25175f88
pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 5224 bytes
font_01_sfnt_off0001130c.bin
aa8e48122d9824e30cd776eec12e841b1963b7a5e4087b96b62bb586b610089f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 10440 bytes