Malicious PDF — malware analysis report

Static analysis result for SHA-256 065043f242afd646…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 04:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1c26d708cca3b58b8a4fd960c7f35377 SHA-1: fceb5494d664e63bf0ad432a7ee182f325135c9d SHA-256: 065043f242afd646d70560b476b18422cee49968e9e4ef577a965f020f33e868
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brawlcall.com/ckfinder/userfiles/files/watudopuwan.pdf In PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/gexasobatu.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/kigoxu.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/59462924986.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109030111131745.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/nakijajezeba.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-12/20210912083807556242.pdfIn PDF document text
    • http://skncn.com/u/files/vomom.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/xekosubezole.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631361596.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/vafokus.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/37857119810.pdfIn PDF document text
    • http://myesen.life/userfiles/file/navalunelego.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/fonexapuni.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/42224584450.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/wagoxumulebifojojuxavis.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/16558452068.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/buxetoxoduguzulasar.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/79048605812.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sizojeburolejameji.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210911000827.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sedopavuz.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/88049975427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=voip+calls+google+voicePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 10280 bytes
SHA-256: d0db70ad261a43b90727e2c0f034d169687f6fac27b492a14f26782937b60f59
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 17524 bytes
SHA-256: 23aa4088893e9bf0397c26db2c449893b236cf1ad41f928ca7d6dda660278728
font_02_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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