Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b39755b845619d…

MALICIOUS

PDF

80.1 KB Created: 2021-03-09 12:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c98a32123152737e45f947f87a77da5 SHA-1: 038afb8388606f8a8a81ec108f38dda91b9c3d38 SHA-256: 00b39755b845619dba058773271749074745026cd8ed46dd1a0fb82ba0e86d9e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary suspicious URL pointing to 'xezojetit.ru', suggesting it's part of a phishing or malware distribution scheme. The document body, though heavily garbled, contains references to 'wkhtmltopdf', indicating it was likely generated programmatically to obscure its true purpose. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+are+the+5+parts+of+a+body+paragraph PDF link annotation
    • http://patedeziw.mypressonline.com/tajusupex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_603440de10948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_5fd8fcdebfba5.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/roland_barthes_death_of_the_author_quote.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/is_there_another_book_after_call_me_by_your_name.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/ensayo_argumentativo_sobre_el_aborto_completo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5fdf64b7301ea.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/facebook.com_support_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fccb5b2a3114.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/kegisexagebijuxurebasujik.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/dell_poweredge_2950_ems01_specs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ab297521-53e5-44c3-9486-03a6eb8016b3/98701964307.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/focusrite_scarlett_2i2_studio_3rd_gen_usb_recording_bundle.pdfIn PDF document text
    • http://lobaman.epizy.com/coduto_geotechnical_engineering.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/is_it_ok_to_eat_brown_rice_on_a_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789f8596-6e24-4761-abb8-8832d1e13c35/40226307940.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/rulukazijiduseb.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/battle_dogs_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/36423700031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf71da9-3112-44d2-bc2b-d79703530908/kuvopagog.pdfIn PDF document text
    • http://zububewe.rf.gd/at_which_plate_boundary_seafloor_spreading_occur.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 5284 bytes
SHA-256: 841e300e00426b117e250afdddc925e18137760d5e9cc1f21246cdafe085160f
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10136 bytes
SHA-256: d2aaa765b3cc36108bbfb1295c3af62b654e153a46d7f56a761c77a9db2a273d
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71