Malicious PDF — malware analysis report

Static analysis result for SHA-256 574c7d46c823eda7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 12:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea1fb44a2ad80774335313e4a9f9e7d3 SHA-1: 69c18a2f89bc37d8686cee3417205fe014a962b7 SHA-256: 574c7d46c823eda7f6c1f1473950d74675f7d9b38c78ca933d51eaebe71d8dab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://mislenyiallatorvos.hu/userfiles/file/80685163645.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/43433790324.pdf
    • https://metricgroup.it/uploads/file/wudejokuvamawo.pdf
    • https://ip-pharma.net/data/files/99243704139.pdf
    • http://szerecsengyogyszertar.hu/editor_up/maxobazi.pdf
    • https://aczv.fr/userfiles/file/borurobiz.pdf
    • http://glassick.com/userfiles/file/wobuguvunidalokoloras.pdf
    • https://ldcpc.com/ckfinder/userfiles/files/sofamixo.pdf
    • http://kirakuramenandsushi.com/uploads/files/nitusofojojas.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/4339deadf3b5f68359172d5196ac187d/81647786969.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobozaginaxanir.pdf
    • http://sanzmendia.com/userfiles/files/mowedepekorutafizetiliv.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/3636523832.pdf
    • https://vroa.pl/chplusfiles/file/59410327560.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48582047630.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/85876490164.pdf
    • http://hanaelectric.com/userData/board/file/9596227926.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/tefezumafesixinevarufifup.pdf
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/wejavulelelewuda.pdf
    • http://pegastelco.com/pictures/files/43401360960.pdf
    • https://onutglen.com/caningest/images/file/4617018239.pdf
    • https://dukra.sk/editor_uploads/files/26003936049.pdf
    • http://denetimmusavirlik.com/userfiles/file/govorazonajexe.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/55046810192.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/50607565340.pdf
    • http://aapltd.net/userfiles/file/setuvazawidijexinuke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+calibrate+compass
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d768.bin
2b0603526f2613e7e6448d6fa86b6d9882dcddf8cdcc2ffb062502931987bda0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 10796 bytes
font_01_sfnt_off0000f008.bin
31646816bb71e0f9df2d7271614d8e1e4c080ec8b0cd37cb3e613f19efeaa0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 18156 bytes
font_02_sfnt_off00011f66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 16792 bytes

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