Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2593aab7981b701…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 08:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04da92c0de82d60e20860e264f52f521 SHA-1: 6e141524f8eb1435beb4389ad879bb10b8393a2d SHA-256: d2593aab7981b701eafe4395c35de7fe95554e03b77ded0cc7e46dbe76a11a2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of external URIs and the 'link farm' heuristic strongly indicate the file's purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=classical+mechanics+by+david+morin+pdf PDF link annotation
    • https://ofertaromania.ro/ckfinder/userfiles/files/gixafafetizumusuxu.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/fulufodaremone.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/41048849471.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/63140202886.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137adb90591d---rerumebuki.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/fegilo.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/36776437126.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/jivupozudizo.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/27756193326.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210911224853.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/37010331379.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/37387632989.pdfIn PDF document text
    • http://rococosofa.com/files/files/97457294224.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/97412090047.pdfIn PDF document text
    • http://hk-keber.de/images/file/ropirupuf.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pevitodufiwajutidunat.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/87804175831.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/pefolo.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/78331497799.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/26580237317.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/22669602585.pdfIn PDF document text
    • http://erictex.com/ufiles/files/voxuvitemolovekulow.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/69243672746.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/84793671115.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d7e684c68299428f5ba27f6feefd7dec/puxaf.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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 11140 bytes
SHA-256: 7a160a7bb68a788553acdf01e7fe385fac50b0da81fb003a61c8ffe77b42d4e1
font_01_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 18488 bytes
SHA-256: 32998bcf65c75c256c53fa3f6e4586ace6a8b4f3b8ed775a75079b584b9c47d5

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