Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d31c804aad816dc…

MALICIOUS

PDF

90.8 KB Created: 2021-10-20 20:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8333f97e5b918c573d22b65d7244d965 SHA-1: 9d8353e9307a51e4a6f66447d7764a5818f8a732 SHA-256: 2d31c804aad816dcef2a44abe98749d29e54f034d919b236242246d07dee7a4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://wastran.ru/uplcv?utm_term=give+me+the+definition+of+a+sociopath PDF link annotation
    • http://captaincook.hu/userfiles/file/mugigomi.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/dowurimed.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/buduluwolozu.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/muberop.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4967af546---19822518582.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fozetinoxafedaxizadovuru.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/9597067721.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16169ce33958c2---65284742659.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/20010171667.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/44320825139.pdfIn PDF document text
    • https://msvadba.ru/files/file/vakomus.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/penotaduru.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sabumesaveliwaradoweduw.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/38333655324.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/disibatewedabazaf.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/mevukuxeze.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148215049bde---gutenawaguwofevigeloxize.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/jetimimifonidijofoba.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/4274584398.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/43038992039.pdfIn PDF document text
    • http://georgecourey.com/fck_user_files/file/96575667457.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/73666755803.pdfIn PDF document text
    • http://kag.fr/userfiles/file/foribesa.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xosawudavelozoxenadosax.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://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_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 16876 bytes
SHA-256: 9697a19a9e5c92b76c28e055cf6c69964a99f16e0c9fa8124fcb866894de3920
font_01_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 10844 bytes
SHA-256: b9702e005c382e4819e7e4b4ff3daa0a1622e05a96de19dd781c482119116603
font_02_sfnt_off000144f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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