Malicious PDF — malware analysis report

Static analysis result for SHA-256 941633f727c76af2…

MALICIOUS

PDF

94.9 KB Created: 2021-04-15 13:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c67c4fa869ce062dace1ab7325f5121f SHA-1: e416f955c9da53bee2c4992d67c09bd39bc2c90a SHA-256: 941633f727c76af29543fd9658357432fe2db9c65f187f0f8c8a04e77bcde0c0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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 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://xajibur.ru/strik?utm_term=ryobi+scroll+saw+manual+sc165vs PDF link annotation
    • http://help-igcopyright.xyz/lite_wall_fhd_undertale_wallpaper_and_lockscreennchuy.pdfIn PDF document text
    • https://bemazoveber.weebly.com/uploads/1/3/4/5/134512295/045d5.pdfIn PDF document text
    • http://nazhivy.net/fuzomuwok0nbjz.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/Ahfiga0/wetojururidut.pdfIn PDF document text
    • http://meriline.store/minecraft_festival_newsletterxxa3t.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/QjccDgh/sexagajiten.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/ek6jjhh/mindtools_leadership_skills_test.pdfIn PDF document text
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/4473394.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/tofesesozutojak-panafavasu.pdfIn PDF document text
    • http://dronextactical.xyz/hafele_catalogue_2018_downloadzsvxk.pdfIn PDF document text
    • https://vanewuzopawibo.weebly.com/uploads/1/3/0/8/130814706/d83707452344fb.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/gMq7yjb/99796729812.pdfIn PDF document text
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/lagogataxunulaxepim.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/vijizevoni-lirivewipojidis.pdfIn PDF document text
    • https://peniluvemafoni.weebly.com/uploads/1/3/4/7/134705148/lapewudez_bifuvekixa_kawunajap.pdfIn PDF document text
    • http://songkfrk.site/lifijanenofiruogvt4.pdfIn PDF document text
    • http://pristav.pro/4580082035cmi0v.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/xareraxulofubologike.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/hhiaB6t/best_adventure_motorcycle_tires_2020.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/558ddc08-4367-408a-87e0-974751d98156/liste_adjectif_comparatif_superlatif_anglais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882dce54-ab3d-4760-87b9-4a7508ffa785/xigepij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6247427e-aa0a-4849-aaf3-422e7ee96a17/how_to_install_3m_filtrete_air_filter.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_off000135b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B1 5676 bytes
SHA-256: 823b169f623280790ca06a780ae6664dacea983bc5ed2ced381910f46f2324a8
font_01_sfnt_off00014917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 10996 bytes
SHA-256: e9534c7ec0c75b10fa1cc2452ce8a9b674a315fe9a70105dcd8b72fa67336c81

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