Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9197580b9dfc6a…

MALICIOUS

PDF

78.8 KB Created: 2021-05-31 16:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91480296123ec3013f8274ae9079ee31 SHA-1: 5b72aa35ebede7ebcf5b8b2e77af1e02b9450afb SHA-256: 1c9197580b9dfc6a8d11eaaec4e2447223761f3da04ead5b48a756816fa3aea5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://soxebez.ru/123?utm_term=6th+grade+math+worksheets+gcf
    • https://surujesuf.weebly.com/uploads/1/3/4/7/134773125/2983647.pdf
    • https://sevipopiwipuf.weebly.com/uploads/1/3/5/3/135302768/wujuvejadumopi.pdf
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/1328625.pdf
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/rifubazi.pdf
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/lovevejowe-dekitogebapivup-jurevofeze.pdf
    • https://todewuxolu.weebly.com/uploads/1/3/4/6/134616468/1325164.pdf
    • https://telenegogak.weebly.com/uploads/1/3/4/5/134522167/jadunexikosunud_bapakotifexarej_zuxuxuxop.pdf
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/6338620.pdf
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/fivinit.pdf
    • https://tuwebiparixe.weebly.com/uploads/1/3/4/6/134674666/venurifixubib.pdf
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/mukoduripegawisizito.pdf
    • https://vonebofakakare.weebly.com/uploads/1/3/1/8/131856314/kinufexozufobexoxi.pdf
    • https://fulopovesaj.weebly.com/uploads/1/3/0/7/130740112/987756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xifilipisi.pbworks.com/w/file/fetch/144414102/how_to_get_free_fire_advance_server.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411849/20_laboratory_apparatus_and_their_uses.pdf
    • https://uploads.strikinglycdn.com/files/26da3145-565b-46eb-9546-10a97c27ea64/lixejopekugabunoj.pdf
    • https://uploads.strikinglycdn.com/files/5b0e4b7d-f0ca-43ef-9899-1dc775464e9c/ccna_3_exam_answers.pdf
    • http://natizasex.pbworks.com/f/nusojigef.pdf
    • https://uploads.strikinglycdn.com/files/00237be1-7248-43e7-958f-480a112fea8c/is_sodium_chloride_solution_a_strong_electrolyte.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144413427/95021529471.pdf
    • http://xojifot.pbworks.com/w/file/fetch/144413610/periodic_table_of_elements_symbols_and_names_quiz.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412365/sibuwafesukarewuwet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e761.bin
9f7e463d1d788ef18552adc207e3527b04fa3535a7f1e4975ad058c767780726
pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 5252 bytes
font_01_sfnt_off0000f94c.bin
4efd7002599fa670ef8b6fb6552d0b16f43108a2e9ef0d22f8cd350dc4d6e27b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 11340 bytes
font_02_sfnt_off00011de0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 4324 bytes