Malicious PDF — malware analysis report

Static analysis result for SHA-256 a218805b8579223f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-06 15:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7a166487c090077f162bae82a8ac8035 SHA-1: baa28d1b9bdb3b834108b52fa84939bf4b94c835 SHA-256: a218805b8579223f12d3234287f251f1b398b503182d81c46ba1aa3b9b823c31
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a domain associated with phishing lures. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=canon+mg3500+manual+download PDF link annotation
    • https://cdn.sqhk.co/fokapalo/ffw0Gig/bape_shark_wallpaper_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/kidirugolo/ejjjiib/58805192735.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/FfjjLic/25948662185.pdfIn PDF document text
    • http://bukevow.22web.org/sql_server_database_architecture.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/echo_srm_230_carburetor.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/hbJjahe/principal_mining_engineer_salary_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/cjgjfgh/selik.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/60869955405.pdfIn PDF document text
    • http://goduvide.22web.org/zujebu.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://s3.amazonaws.com/guvovigo/2220898328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355997bc-b6f5-4505-8d96-e0e904a8cdba/what_does_find_the_roots_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4996c698-cc15-4052-9278-d3d30d7f3b8f/bazonujerepisozunul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31b1acd-7d70-468d-957a-43c2752ae813/what_is_the_best_glitter_eyeshadow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee5dce9-1486-4c58-9d22-a086970e9fc3/tabla_de_medidas_de_tornillos_y_tuercas_en_pulgadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1757eda9-4f6e-4ae8-962e-b4bd973d07f0/tomtom_go_500_battery_change.pdfIn PDF document text
    • http://damikofem.rf.gd/eclipse_neon_for_java_ee_developers.pdfIn PDF document text
    • http://mapixuxiloko.epizy.com/kumbalangi_nights_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/koxutuvidobizivaxusiw.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/93177923811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebdcc75-0ac7-45e2-892e-72f92f47416c/tuvatakobesikavebunature.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_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 5052 bytes
SHA-256: 57c05c138fc037b847578f338456fabe1b8fee632ee0d1fc7d34eae96cb9ea72
font_01_sfnt_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 9920 bytes
SHA-256: a2aae349e030d835dd3dc1f2bded3ff7375cb9f57de4da75b5ad3c1d8d9b272c
font_02_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378