Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca91bc3e0c1aaaa…

MALICIOUS

PDF

84.3 KB Created: 2021-02-17 10:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4bd3e05024fad13697be98550e162493 SHA-1: 5bf105fc410dd74faa56c38e2d197bc35f4961ca SHA-256: 3ca91bc3e0c1aaaa1b1a0939e6b1e267c777d71fcf08a14f749909b8e95d00aa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the structure of the PDF are consistent with a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=bodmas+psc+questions+and+answers+pdf PDF link annotation
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/kuxariwabu.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/XiijH10/dawuloxetavogurojemoxip.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/jbhhidP/kaiser_permanente_washington_job_openings.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/6hg6jgk/51880915394.pdfIn PDF document text
    • https://josusijino.weebly.com/uploads/1/3/0/7/130739082/dupajazunobugojotiz.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/fesuguritemes.pdfIn PDF document text
    • http://newyearshop.site/lofegizipagudawomirofoh10tn.pdfIn PDF document text
    • http://jalakerag.22web.org/25191841601.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/xarejugel_birizomuguze_dilakosud_bexixijekusom.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/gtQhghf/mutomukujilosuvabojetu.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/xiwixalugova-vaxekapex.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/ohjjezK/nuxarupukaf.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/CgghcOG/delicious_world_cooking_restaurant_game.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/2thciex/17037320020.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/AuhgEw0/download_infinite_flight_simulator_mod_apk_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://lisotabisalak.epizy.com/interview_questions_on_cloud_computing.pdfIn PDF document text
    • http://gubadix.epizy.com/avg_antivirus_pro_apk_mobile9.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 5536 bytes
SHA-256: 31523c3da11dd20276b5bc7dcf290e19e511bb010a744142c231de20bd0e7169
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 10780 bytes
SHA-256: dd3d47365e2de0d0adbcf44ed6c9c5b756c37bc20919ff463cd3a29595ec2025
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 11420 bytes
SHA-256: aafeea126dd72fe23999e0134e69cba825aba1bdf3df7640f8c6d398c44f66a2

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