Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1923dd145ebdd84…

MALICIOUS

PDF

83.1 KB Created: 2021-05-23 12:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ae220048df617c0444d8d1a6a60bea5 SHA-1: da7e7bb97354dc7315fda8992a836de260248d5e SHA-256: f1923dd145ebdd849a9bcb059f4b37b99529585e3506e113a6590f1d59404af5
186 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 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://dugedepap.ru/strik?utm_term=how+to+fix+a+shredder+that+won%2527t+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444644/normal_60230ceeb88fc.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/5985364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_603c39ebd6f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403676/normal_5fd8cea52d5bb.pdfIn PDF document text
    • https://xotinibawilufo.weebly.com/uploads/1/3/1/4/131437660/nuwaguzululitegedej.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/rumirukikotewuju.pdfIn PDF document text
    • https://susotavawo.weebly.com/uploads/1/3/5/3/135325365/6784844.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/rawenoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_601dc6f10e263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fd129a16f6df.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/6499282.pdfIn PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/7237895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418777/normal_5ffd24a62ba3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fefffcf42f48.pdfIn PDF document text
    • http://www.fotolia.com'>Fotolia.cIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b79ce4-b1ad-4b97-a66c-4dd5de7199d8/us_navy_chief_petty_officer_dress_blue_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a883fd03-153c-4d68-a238-19d965375b5c/3691282240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fc3502-5974-4840-95a7-723e5705e573/chicago_manual_style_in_text_citation_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f33c37-4aaf-446a-9db3-a220038a3c16/tokoboruputaxexani.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/breakup_telugu_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/toxibagijamefeg.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/pepabisuxus.pdfIn PDF document text
    • http://www.fotolia.comIn 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_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 5116 bytes
SHA-256: 380a436c84af40837c2a3915bd9a5ee7cef76b82644e5b10b02887dc7a5c64d9
font_01_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 11204 bytes
SHA-256: 442f8925002e768d899d0f7a664f355470c54720236418635e65635ec12fd63c