Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa47a529aafdfd39…

MALICIOUS

PDF

157.7 KB Created: 2021-06-04 12:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4724087a0ea54ccb1eee1646b4ca33ca SHA-1: 0a8ddfea7c8c563376c63dc8a66e5df9cd7ddd4e SHA-256: aa47a529aafdfd39cb128369f6e05be826256b8cd785b7802314167134f60127
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://zajinet.ru/123?utm_term=formule+gaz+dioxyde+de+carbone PDF link annotation
    • https://vexifodukegaze.weebly.com/uploads/1/3/5/9/135977609/6482217.pdfIn PDF document text
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/lezamolumuvurokon.pdfIn PDF document text
    • https://pegotovu.weebly.com/uploads/1/3/4/8/134855979/vipomabagu.pdfIn PDF document text
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/d5c2c7bb2e73204.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/5629971.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/6037223.pdfIn PDF document text
    • https://waponalafax.weebly.com/uploads/1/3/4/5/134529016/panovigoguxidaz.pdfIn PDF document text
    • https://megogolu.weebly.com/uploads/1/3/4/3/134314378/kesegu.pdfIn PDF document text
    • https://vasigigu.weebly.com/uploads/1/3/4/6/134607878/rutewasuvorevu_nilenejilaj_tijiwafi_mawutefanosof.pdfIn PDF document text
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/nobefulimos.pdfIn PDF document text
    • https://bigamurutixigi.weebly.com/uploads/1/3/4/4/134481126/f0ff0e316fd.pdfIn PDF document text
    • https://xewoxexe.weebly.com/uploads/1/3/4/3/134398473/a9bc464bff5bdb.pdfIn PDF document text
    • https://kaxamixerev.weebly.com/uploads/1/3/2/7/132712358/xevepogepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144556653/why_is_my_victrola_record_player_not_working.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/w/file/fetch/144568269/why_does_my_vtech_baby_monitor_keep_turning_off.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144523434/resumen_de_la_obra_los_gallinazos_sin_plumas_corto.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144441114/75999762051.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/perio_charting_form.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/wijujagiwisegakoninowekit.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144454011/norton_field_guide_to_writing_with_readings_5th_edition.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/why_does_chat_noir_call_marinette_princess.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_off00020c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C58 5396 bytes
SHA-256: 729aeec612a62b0f9a77ab6119c622b6b99b357232b859f159b21e1362cc8014
font_01_sfnt_off00021eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EB1 16324 bytes
SHA-256: a53f0d376da809f6ccba1a7bc489e77e44682a773a741f5b1ff598d0e4c7bc3c
font_02_sfnt_off0002513d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2513D 16304 bytes
SHA-256: 55bbee75c207f5cb416e23b28aaf79c9279d60b3c7866ca70d71f0a957e2b0d0