Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd37e5eca44719a9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 10:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d34b4a1a75fd82d851d259317812b90 SHA-1: 2b2800f79e40dd598bb4ab4638ce1fd517eb819d SHA-256: fd37e5eca44719a9e690bc67bf79a363ee4d4dac2ecb247000894966d2d88a21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wastran.ru/uplcv?utm_term=friends+watch+online+season+4 PDF link annotation
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/garilupowotudejatu.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/19318010834.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/deburarokenizinoluwuko.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139842ae4afb---tajofaximosubav.pdfIn PDF document text
    • http://signauction.net/userfiles/file/79307505293.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/36156461148.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zadorujotixenan.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/nunilewibejitodage.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/43449225409.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/98895392334.pdfIn PDF document text
    • https://materiale-parchet.ro/fisiere/file/11922990211.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/jekajuwoxuz.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/bobubuk.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/58307850379.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/najuwimuwopijeruw.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/12222848769.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/fujatixakugezu.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/gamojatexa.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/segonaboxezaj.pdfIn PDF document text
    • http://medrea.ru/upload/files/zejiwujotijo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/70617703236.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/98225648849.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/zofatefujajisezadila.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/sasaja.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23582892097.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://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_off0000b101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 15504 bytes
SHA-256: 19c78ea0c5971950391989de444e8e0dfb5e1bf6c70cd783bd4bbf0ea693c97c
font_01_sfnt_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10608 bytes
SHA-256: 3b0b1b5a9613c0729b372c70860ac78a3ce63fd30ee132e1f00ba3d91b00edae
font_02_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1