Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e9c906c92d9801…

MALICIOUS

PDF

89.1 KB Created: 2021-03-18 04:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 15c7ea38eea98df70f81f83e797bfd84 SHA-1: b418740a2b7a11415cb0ad52c1014cad83249248 SHA-256: b8e9c906c92d9801fc0736de77106a7e0f8630338c9e6af07aded1fe980b707f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure itself is used to host and distribute these malicious links.

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://leonvi.ru/strik?utm_term=what+does+dormir+mean+in+english PDF link annotation
    • https://cdn.sqhk.co/dokukavifig/DihgcmT/filmora9_user_guide_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/Iidhjge/chuchel_2_apk.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/57652620896.pdfIn PDF document text
    • https://bakemelufipunuj.weebly.com/uploads/1/3/4/8/134888112/megod.pdfIn PDF document text
    • https://rafopotoze.weebly.com/uploads/1/3/4/6/134609035/xusojuvelonawem.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/deperu-loxijezirod-vuzatagovefovo-gurasuwu.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/73273d47102.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/f4a1fc2e.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/fnUtjf3/bizopajokab.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/folugikogesipix.pdfIn PDF document text
    • https://jutisopi.weebly.com/uploads/1/3/4/7/134775863/1a29799af86184.pdfIn PDF document text
    • https://cdn.sqhk.co/vikimono/djcxXhf/fagesiwuwuxatixabubofeb.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/nomujoje.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/diituU1/kisimotitokevimapulogonaf.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/4afe667d-a385-4604-8812-aaae04d2723f/gatipoguxafiruparuki.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/lingus_bass_tab.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_491f9be280e84d9d94d79ef68fb8ca96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6350ae23-41cf-405d-b845-ea437386f56b/the_road_not_taken_theme_analysis.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_415076208814494a8ef7363fb514ab4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3d8791-6aa9-4497-b7a9-e21f8b4aea5d/concepto_de_investigacion_educativa_segun_pablo_latapi.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_be36af2846694e86a932d82c27fc772b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a07d396-0238-4712-9ee3-d33715077a15/how_do_you_start_a_sports_club.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_3b6e10ccea2f42a1bf2c800430ef286d.pdf?index=trueIn 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_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 5252 bytes
SHA-256: 6d8be942062cb52e09697142a0fb31b7c5c391feeb7e83c3112c1a750565c006
font_01_sfnt_off000130b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 11776 bytes
SHA-256: e9a8c5691f5fc6f4cfb1b8273bfc3162eaba1c81de194cde9fe5c6e308d461ef