Malicious PDF — malware analysis report

Static analysis result for SHA-256 c111b4e1857f0805…

MALICIOUS

PDF

71.7 KB Created: 2021-03-20 14:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4b5249e09a198e1f8087d97c726b8f2f SHA-1: 1997260ab6687b9cf6f04a7f97f399a1d505580a SHA-256: c111b4e1857f0805483989c6e40be5a6c362d85ec71ba5993dcaf27e80f2c983
186 Risk Score

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-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://mezovuduw.ru/strik?utm_term=emily+post%2527s+wedding+etiquette+6e PDF link annotation
    • http://prizinsta365.site/universal_remote_channel_master_dvr5aeyp.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/qgcyjgw/6250253197.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jiL6jbq/76394770827.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/q1ielin/wapezuvavikisasinuduli.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/darezopezuvon.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/basketball_court_dimensions_in_feet.pdfIn PDF document text
    • https://cdn.sqhk.co/lezubenewago/iCBfhfT/42165585632.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/JLih57X/86324940718.pdfIn PDF document text
    • http://iblack.space/sadugipuropogijijozomimexww6ar.pdfIn PDF document text
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/wegiwa.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/disekapavijowuw.pdfIn PDF document text
    • http://magic-spring.com/xejalojezarenifavi4t08o.pdfIn PDF document text
    • http://furniture21.online/sccm_locationservices.log_location9pxf6.pdfIn PDF document text
    • http://interbankdigital.com/advantages_of_social_media_on_academic_performancefy8xx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_2f77c3b81d494f05bb72509b45014da7.pdf?index=trueIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/xunakejab.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/fl_studio_12_tutorial_in_hindi.pdfIn PDF document text
    • http://vekamodadon.onlinewebshop.net/90865505597.pdfIn PDF document text
    • http://lorazak.epizy.com/vikusuvevik.pdfIn PDF document text
    • http://gojikelo.epizy.com/cuisinart_fully_automatic_burr_grind_and_brew_user_manual.pdfIn PDF document text
    • https://0a9dc515-c6d9-419f-b4de-d801a8c2a39b.filesusr.com/ugd/760a4c_0e01f59fe0404bdb8f5b68ba5d3ca1e3.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_56ed094c8c774619986aba50c5bf68d0.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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 5436 bytes
SHA-256: c94e7a33688409a95ba00c52a8833b43629e1d1e24a171dd4aa0afad790ab70b
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 11000 bytes
SHA-256: 2d03956ff7cd5def0cc46c67212c220c2958122899a86cd5801e7a74a6106b92

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