Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2d6de158edbc03…

MALICIOUS

PDF

80.4 KB Created: 2021-02-27 07:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f109934b1881a5a0e1d2e5bc1e35f79 SHA-1: 35d402ae8fe74f57739c2f99f2a167d11d3dafa1 SHA-256: ae2d6de158edbc034cb41ffb76bea154ca1f2eee78c841025a5e493d8db10c53
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=death+note+characters+white+hair+name PDF link annotation
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/kigumaxem.pdfIn PDF document text
    • https://mokoxofedig.weebly.com/uploads/1/3/4/8/134891763/xulevak-ripotadavij-bitinu.pdfIn PDF document text
    • http://laura-egorova.ru/meaning_behind_father_and_son_by_cat_stevensybsqq.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/3054027.pdfIn PDF document text
    • http://rolevuses.iblogger.org/ccna_cyber_ops_lab_manual.pdfIn PDF document text
    • https://gajerekore.weebly.com/uploads/1/3/5/3/135327587/wedifawe.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/a4jhgeo/71368200835.pdfIn PDF document text
    • http://circulshtangcalip.website/zevinigodaj846fm.pdfIn PDF document text
    • https://repamepofasepa.weebly.com/uploads/1/3/1/4/131437198/9632764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifezuragumizi.rf.gd/can_t_be_erased_jt_machinima.pdfIn PDF document text
    • http://torobedi.epizy.com/jabamalojugumuwujewupuxe.pdfIn PDF document text
    • http://rigutogivopum.epizy.com/microsoft_dynamics_nav_training_material.pdfIn PDF document text
    • http://nerivuwosisom.rf.gd/8024611347.pdfIn PDF document text
    • http://pujixedigegogup.epizy.com/borbaad_songs_320kbps.pdfIn PDF document text
    • http://darewuxopasog.rf.gd/kajinag.pdfIn PDF document text
    • http://dogugamegomijit.rf.gd/menarukuguvimerop.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 5096 bytes
SHA-256: 33be7af74ffd691af458a6d7cb36b5ec2f4458d7d41d3c72cd027620413539c8
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 3232 bytes
SHA-256: 51609604e1a64c44da7f5b8a216b9d8aa445018f5e48b331c0d2842fe4a8fbad
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 10444 bytes
SHA-256: de9ad363b7e571bf6a63b97d914a30c1439a72948219f70bdfbb1ec837c37750
font_03_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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