Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d539ed16f26d3a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 15:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad8cde569285ab9f12c8d561c68db23b SHA-1: 4f86c134fe296eef9a8132f341e03ce00cf8d96f SHA-256: d9d539ed16f26d3a28dff0a04d5517092f1439907ec0b0099a80b41cd91de2d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=california+critical+thinking+skills+test+questionnaire PDF link annotation
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/vakurekazewu.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/xilab.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/turetajoxuxogita.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/zonelob.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/sunutoxabogoladife.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/15031292939.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/68791858535.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/20438467229.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/14051774412.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/dutabowirapaba.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/97326048783.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/fokuvu.pdfIn PDF document text
    • http://wmsone.com/eimages/file/tilij.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/51884215664.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/26065270685.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/38464393724.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/lumezagufu.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/tudalof.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/povegimopeju.pdfIn PDF document text
    • http://usmleworkout.com/files/file/7082018195.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/kopimosiwa.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/vodepuri.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/98215895711.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_off0000bbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF2 10984 bytes
SHA-256: e3e91ce97066f9ea7aca4218c3b14966acfa540bc699e4c9d7fcdce16b14b150
font_01_sfnt_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 15532 bytes
SHA-256: 68dd883ae8ea128d7ee216a547a9a683e6a457d5ef6db14b2a5c70807a75d9c4

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