Malicious PDF — malware analysis report

Static analysis result for SHA-256 57628060319ee099…

MALICIOUS

PDF

70.9 KB Created: 2021-04-05 10:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b48d5e856c63ac5f61e851db218dbe92 SHA-1: e9f42a0dc05de5da1a0881e4bb538c6145360716 SHA-256: 57628060319ee099e8b4c50db6c88ea5c5c10aec992958586744056ea94fa407
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=thank+me+later+album+download+zip PDF link annotation
    • http://nelilovodik.scienceontheweb.net/bikotelitazidogaxovavitu.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/lufewosujokavaduta.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/kibapipusi_gizok_seporabogus.pdfIn PDF document text
    • http://filfex.ru/laxisipafufimazopopsswc3.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/11682647021.pdfIn PDF document text
    • https://cdn.sqhk.co/waxubisolo/wFv5iis/stbl3_cells_transformation_protocol.pdfIn PDF document text
    • http://loveworld.club/rheem_criterion_gas_furnace_pilot_lightye7bd.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/m13uhAI/zupugod.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/2240797.pdfIn PDF document text
    • http://fionainthefield.org/44066255347ahl5z.pdfIn PDF document text
    • https://susuwiwonilo.weebly.com/uploads/1/3/1/6/131606006/buxixeziketurag.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/iag5ijr/narcos_cartel_wars_sicario_gustavo.pdfIn PDF document text
    • http://kurutog.mygamesonline.org/abdominal_ct_scan_results_interpretation.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/jepozivuwabak.pdfIn PDF document text
    • http://habercigo.com/60189782774a1l91.pdfIn PDF document text
    • http://negozio50sconto.info/22439101440rioen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_924a5aef14f94acb8dcb2ce6bd47ce1e.pdf?index=trueIn PDF document text
    • http://gurabagoderes.atwebpages.com/applied_behaviour_analysis_cooper.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_a9933af96a014b82a180ff3ea0a29ddd.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_44737faa4763433c83112ef5e25ee2e2.pdf?index=trueIn 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 5316 bytes
SHA-256: 31db82f307eb6968a0643a2db3b441a7784c86ad1269423353630be57ca0959d
font_01_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10840 bytes
SHA-256: e67caf83701273ece5eab63e5741613b77e0ce4bde2867158f5e4f97bdf04995