Malicious PDF — malware analysis report

Static analysis result for SHA-256 daef8e34712d0256…

MALICIOUS

PDF

68.5 KB Created: 2021-03-17 00:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0ddce307af235460d95ca5333cb98a75 SHA-1: 3d9fe118c7374919e2f849699cc0c4222c835936 SHA-256: daef8e34712d0256f93724dd1558ccedf97adf068d0fb0c7f0bf277299a6e8e6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a malicious redirector link, pointing to dafemum.ru. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on CDNs and S3 buckets. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the presence of malicious links and the overall structure suggest an attempt to exploit users via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=living+and+non+living+things+comprehension+worksheets In PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/hajhdq6/kokisenusogala.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/1idWmEH/98557037121.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/hfij4C2/putizasovuj.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/Eja6bhd/58136028259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5ff7c7ce0d97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5fd9fb2f23957.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/TZyh2fQ/big_windstorm_utah.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/dDhhjgX/gatuxosiwesizetapilaluwis.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/bewaf-zebajoxokegi-xugepeke-tesajedo.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/lesexekekuxudopobomu.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/Vggeute/cinelli_hobootleg_geo_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/YwqUIWL/rojoxofapoxatiweba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_604494b55aa50.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/g7ri5eq/todogubifoze.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/71c29036d6d137.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/pjgeig0/pastime_paradise_sheet_music.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/jiwisi/wifi_antenna_for_android_tv_box.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/autodesk_inventor_fusion_2013_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/jidatit.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/service_portfolio_management_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/what_are_the_elements_of_the_poetry.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_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 5644 bytes
SHA-256: de3a75c31471b14ac08f9d50da6f342142dcbe8e9c528ed3df4740a697a08616
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 10648 bytes
SHA-256: f359efd0a5e0feca1bcac1b53e9649ee501d9e39f6d04cbece284f6de7c7cac6

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