Malicious PDF — malware analysis report

Static analysis result for SHA-256 0407ee8f786d68db…

MALICIOUS

PDF

102.4 KB Created: 2021-03-09 08:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 99a18b84cd30d893622756cf84ad5c95 SHA-1: 9a0a346dc640dc479476647474769cc92be81d42 SHA-256: 0407ee8f786d68db221914a89d243111988a243f1eaf8fdfaf0f3fbeefac092c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many hosted on disposable domains, suggests a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the document's structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://golowaki.ru/wix?keyword=metodo+de+suma+y+resta+julioprofe PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fcc54df17203.pdfIn PDF document text
    • http://6gusevshop.website/is_dvr_free_with_comcasthmpuy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409394/normal_6001b201b2d13.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/aGWja9C/telijo.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/hjdheia/84263026851.pdfIn PDF document text
    • http://larebalin.mypressonline.com/the_saxon_stories_tv_series.pdfIn PDF document text
    • http://study-english-02.space/rumepigivimalalavzpstz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_5fdc08e4b460d.pdfIn PDF document text
    • http://vvinorama.fun/55740400860t3a7v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_60127d4447ed1.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/NhfLjdq/jotinusuw.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/lezalerin.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/how_to_use_devacurl_light_defining_gel.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/gigfbxR/carrera_rc_battery_3._2v.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/BuijjfF/18382444212.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/xuxedaw.pdfIn PDF document text
    • http://meetly.space/the_beatles_anthology_dvde4ag4.pdfIn PDF document text
    • http://gonzo-3d.com/90749850356d21mi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5ffeb23d247f3.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/gIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_b0e78e96432f42bbb1945a0d8ae7aa50.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_22339728c9eb4d99864cee634b3b865d.pdf?index=trueIn macro / runtime command snippet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 17204 bytes
SHA-256: 1d232dfcf6e177eeeca57a6c6a28c54d137f573705f56208b0d29f18430542e1
font_01_sfnt_off00013d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D73 5372 bytes
SHA-256: 3688b54d85615375ae96ea5ae33c42953def57cfc65c85119cdd5493656bd0c1
font_02_sfnt_off00014fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB1 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off0001583f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583F 15560 bytes
SHA-256: 2f8391d7c777985f4a98e718636598a0d5df42381c22e23d1bfb035be0ae3e1c