Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05a3ac5f1aa1c6c…

MALICIOUS

PDF

79.5 KB Created: 2021-05-30 20:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a029afcbe901bd9aeda2373ef56c35b9 SHA-1: b40b803dd7ddf6392e2f4cc51cd49d925d153a6e SHA-256: d05a3ac5f1aa1c6cacf74dc2b0ae2a7e79e8ee53078660f9fef331a36f745afe
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/123?utm_term=clash+of+clans+october+update+apk PDF link annotation
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/fesogeguxemotoguj.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/3673335.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/fesedegup_gunidapewomoli_vitave.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/vasidulol.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/nafelajanu_wixilipolediwag.pdfIn PDF document text
    • https://zolopopi.weebly.com/uploads/1/3/3/9/133999976/migufeposoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_60556f1045ada.pdfIn PDF document text
    • https://xakelagus.weebly.com/uploads/1/3/3/9/133997825/jesoberapomisaneb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5fc9332f25cf9.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/zomafesolapabuxufak.pdfIn PDF document text
    • https://dekavodo.weebly.com/uploads/1/3/4/4/134438155/95010adf402d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381980/normal_60b28ad62842d.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/gokesinaf.pdfIn PDF document text
    • https://kezopepeza.weebly.com/uploads/1/3/4/3/134332650/7889106.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/5845245.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/419678d56c1.pdfIn PDF document text
    • https://ziripovamenof.weebly.com/uploads/1/3/4/6/134647136/vopuzup-musofevaguw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf3b727-b7a6-4e62-ba14-e2f90fe7ca0c/how_to_get_ringtones_with_apple_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0afeb14-ce1d-4efd-af3b-50ecca984e89/what_is_the_setting_in_stave_1_of_a_christmas_carol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc09019-64e7-4909-a0d8-c694d9e963a1/how_to_program_genie_model_7055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1559a00d-9a2c-460e-8066-36462f5cb6b9/11314607588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcea3270-127d-44fd-93d9-d4b676a4fb7f/engineering_drawing_sectional_views.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13973720-625a-4528-8bfa-a1da6e9b44a2/graphic_design_books_to_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/348969aa-89ac-4a46-89da-1191d0e8fec7/guion_para_comic.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 5352 bytes
SHA-256: 2ce5002b3df4a5b005a9aa40af46e91eeffd59889758cd47937cb76786896943
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 11252 bytes
SHA-256: 6d2c9469d6e3b14b2331fe9ccdb297fec13d85419017cd74f9818bec5e134d6a