Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd6a6d72f24de21…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 14:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 392803a681619e333fc499b7e2dca816 SHA-1: b16c3446e2a7404b8b6844903571a3cea8898536 SHA-256: 9dd6a6d72f24de21c5d7a36f9fcf3260349ca6c9aa186fe69d7261bd26564cae
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one identified as an algorithmically-generated URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=dungeon+quest+apk PDF link annotation
    • http://myconnect-thailand.com/image/upload/File/16700504470.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/wataninenis.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/30922081907.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b1jfjgaj92235mobuu8ietjeh3/bedonewufawewiko.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/bilixebob.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/zizubowosajafapa.pdfIn PDF document text
    • http://guchen.ru/d/files/zesonil.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/46527454032.pdfIn PDF document text
    • https://funbugs.ie/files/file/dulibaporerexes.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/malerorodinenisolomopop.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/fojafosidojugoge.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/xugisifix.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090809172173499.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/29460333769.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tubazezujora.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/pabojixesusorolututoxuji.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/bakotazikewewofogevixemo.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/81392106882.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/74052810597.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/susifome.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fafagapirawopiji.pdfIn PDF document text
    • https://festacontinua.it/public/file/29242170725.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/98514997329.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_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 10528 bytes
SHA-256: dfe45be335c7a7cdbef03de1b2e85cc624254f6cfa6cfd1c773ba6ea9c05a5a8
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 17520 bytes
SHA-256: d1af1042302815045736bdf181a0b46b40435acb4d2d26bf90926d3f19dfa0f7
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1