Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ff4cc6f6838061…

MALICIOUS

PDF

96.7 KB Created: 2021-03-20 18:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9c3cb20c125f0e761f4a9cc3b5de3c02 SHA-1: 3c743beb71661b9bd742eaa06a3810a018f45855 SHA-256: 43ff4cc6f683806106d135af36f691115675bf0547685f2a843f435dbdf97872
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into clicking these links. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dugedepap.ru/strik?utm_term=international+financial+management+madura+solutions PDF link annotation
    • https://cdn.sqhk.co/giruzegovu/ljhLjd3/gatejubesafu.pdfIn PDF document text
    • https://cdn.sqhk.co/lovolipeg/2qW0gg0/fizilanuxozumijorad.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/sjdJijF/60000775353.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/yFjgjbh/36274384705.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/iiw1phf/online_marketing_programs_toronto.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/df06e00b2bf.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/gfBr8hc/download_game_world_warship_combat_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/dY6Qjhj/joker_music_ringtone_download_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/iccVqd5/top_live_channels_on_youtube.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/769c526fc3.pdfIn PDF document text
    • https://cdn.sqhk.co/boxoveru/yg5jdID/arma_tactics_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/PDjjUhc/jozudawo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/22913036611.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_93003f9760734a86817def651eccab51.pdf?index=trueIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_2923cb36b96d4758bf854d601dc29e64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/83329758291.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/entrepreneurship_reference_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4704419f-6454-476b-8bed-39cfbafbf485/nekevaxavasidigu.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_25e781df321146008f0547fbeb8088fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/260d3ebb-6b6d-4755-b11c-a6c0ae7ba15c/54700094747.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_off00013cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF5 5276 bytes
SHA-256: 4ee648e2c76a2b1880d39ba1e1ab34c99451407ce041999983d2b5b7882f840e
font_01_sfnt_off00014ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED3 11336 bytes
SHA-256: 9b98a517965a6688dd36ef37964c9b1798262dc089978fad36dec4461e05469d