Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eda47148c1a75c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 00:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f95dbc963be4a3df9694249679fc095 SHA-1: 5ed091327189754914a6ee9c1d92d14a0291f15b SHA-256: 86eda47148c1a75cb48bc32be80f823abbe6cf5915ccd1d12531670078c2c5d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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 http://study4student.com/cache/fck_files/file/bekivuzusa.pdf In PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/74357384971.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/493884321.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/69661634314.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfa5e127a9---lulizuvuxotadivitobisum.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/zozumowukisovejaxeluluge.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/futimoxaweze.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/korojutitipovebiw.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/14463735859.pdfIn PDF document text
    • http://epplast.com/files/file/zopit.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130209a837eb---21198999588.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/kadetajakon.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/30292807843.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/4401999818.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/palironosifata.pdfIn PDF document text
    • http://kant21.com/userData/board/file/fabisapejakusurajaj.pdfIn PDF document text
    • http://cpviettin.com/upload/files/sevidameto.pdfIn PDF document text
    • http://meta-min.com/files/tidamoganatabetafuxu.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/8016422719.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/xabujofemulefadusate.pdfIn PDF document text
    • https://visualarchive.bg/files/kinonotiledaliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+hacks+in+minecraftPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 10772 bytes
SHA-256: 42fb0870615686521668b16940558ce56efd2af55e7ead844ec37ef9796ec9b5
font_01_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 17476 bytes
SHA-256: 7c84425a10048d98023240384a4c469d6d833ddf6a05db45d12e969157503fa0

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