Malicious PDF — malware analysis report

Static analysis result for SHA-256 557dbad6b0ccd659…

MALICIOUS

PDF

82.5 KB Created: 2021-10-14 12:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e854babf6b307a31fc0b29ddda1a631 SHA-1: f942d61a39a96585faeed1fca60e59cc3fd5b3ea SHA-256: 557dbad6b0ccd6592e2a1c03ec8e109dc754c6cc2df0e4b7d0747a578cba61f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous URLs pointing to PDF files on various domains suggests a phishing or malware distribution attempt. The primary attack vector appears to be users clicking on malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://n3ss.ro/ckfinder/userfiles/files/28737794752.pdf In PDF document text
    • https://ever-progress.com/upload/files/xogusetobefujuvubaxe.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/87750339810.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/fulomazutevezuxegume.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/xizibutaxavujumazi.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/36355467917.pdfIn PDF document text
    • http://robbes.nl/media/files/64501742616.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/gigikojijib.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/mozopejeka.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/98050469176.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/8519978527.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd8eb9750---vutigoku.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/gakijoxavewenekoz.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zafam.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/zidubewis.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/kubogezoridutijaxitip.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/77695482740.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/pupekolar.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146834fb58f6---tusorarevezofejunubuza.pdfIn PDF document text
    • http://metallpress.info/files/38122662831.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81629585961.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/98340614284.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/ninabonuwifazuz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=justin+walker+from+cluelessPDF 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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 19792 bytes
SHA-256: 574cedfefa27927c3a95a2368f26929e118ea738eec31dfbb9b492ac2dc45b1c
font_02_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 10768 bytes
SHA-256: ef9d5a230fba3d53016c76a529c109080a86826e0fb86fafb8adbd2240d28fdd

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