Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ef8261abd46582…

MALICIOUS

PDF

91.3 KB Created: 2021-06-04 00:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 444bdcf4739a9cb4d6d8255d6948f0b4 SHA-1: f13db7f6aaa80945833a0a190bb2a412c1f3f7c0 SHA-256: 86ef8261abd4658245a17fdcb561811835f766cdf087432b0dda095144a00d00
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a URL with 'utm_term=arsenio+lupin+libros+pdf+descargar' indicates a lure to download pirated content, a common tactic for malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=arsenio+lupin+libros+pdf+descargar PDF link annotation
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/modisisipi.pdfIn PDF document text
    • https://jikanozirupeson.weebly.com/uploads/1/3/4/6/134656521/5f05c7.pdfIn PDF document text
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/silofakivaruni.pdfIn PDF document text
    • https://risibazizugati.weebly.com/uploads/1/3/4/7/134710005/giwob_samonoxaropami_roludujarevom.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/boziloponudezo-fajusidutura-bovusetimot.pdfIn PDF document text
    • https://jazoruwaru.weebly.com/uploads/1/3/2/7/132710784/muwekovarenixi-mupov.pdfIn PDF document text
    • https://tekujutiwud.weebly.com/uploads/1/3/4/2/134234893/531150.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/midokus.pdfIn PDF document text
    • https://lumixiwutetus.weebly.com/uploads/1/3/4/3/134388296/4327251.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/9114191.pdfIn PDF document text
    • https://sikezenubotimer.weebly.com/uploads/1/3/0/7/130739875/6063140.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/042b02.pdfIn PDF document text
    • https://xubedemowixur.weebly.com/uploads/1/3/6/0/136004279/bogavudal.pdfIn PDF document text
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/kukanebegevig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144414087/diary_of_a_street_diva_free_download.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144488778/3d_printed_house_builders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42505db0-90c9-44c6-b9cd-973eb683be49/jajiwemokewevokej.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144554442/6th_grade_math_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fef3d3a-dfa5-476f-85e3-e35ace6b2ba5/is_gdp_a_good_measure_of_economic_performance.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144447921/can_a_centipede_bite_kill_your_small_dog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd9c269-4acd-47c5-a383-f38f1a4b87bc/18791603074.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 5452 bytes
SHA-256: a4992106e0af5345fc1538f2ece8a9c0818b89214558d61832f1d4ecacbb29c5
font_01_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 12284 bytes
SHA-256: a66f3af129ba7621e254636d51081731b8f76dcc9b6113d64cbf656522dbf556
font_02_sfnt_off00014874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14874 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449