Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29c2e9bb93d12f6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 15:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88e5cd1baecea83ddf4436dc84636cb8 SHA-1: e2e6cd5a1cb819236f29f67b1556074e09878ea7 SHA-256: c29c2e9bb93d12f6221ffa4478f717c1464b557ff8f38d33f2c087eb96eaf95d
154 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. The presence of numerous external links, including one pointing to a potential malware download ('uplcv' endpoint), and heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_DOWNLOAD_BUTTON' suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=punyadinamalle+full+song+mp3+download PDF link annotation
    • http://etnorom.hu/pictures/mipumedutukovumevinikesoj.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/pazodakerodazukomedozed.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/74691881808.pdfIn PDF document text
    • http://hibertek.com/image/files/20210909_004959.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210912012445.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/gabukedilevozazim.pdfIn PDF document text
    • http://novafish.it/userfiles/files/weben.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/45520954364.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/nudijekejajigexonomem.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/zufatuwezegusodagumi.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/19732069171.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jolifukalage.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/32265286481.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/nizisupavarojakopotaxuzoz.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/xexus.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/36070705175.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jefivofidikizugupa.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e518b2f1---59776054371.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/tuwise.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/fijukowozizil.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/fededujosovuwo.pdfIn PDF document text
    • http://sbairs.com/datas/files/54026287512.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/34191807454.pdfIn PDF document text
    • http://vodova51-53.cz/files/jeloxorezegejufu.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_off0000c175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 11116 bytes
SHA-256: dbf37c256c0205a2494ec71706b4541d6fd0d532eb0eac18d9cfc6b5cdc2a347
font_02_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 20260 bytes
SHA-256: 95d17d97161cd395e4b90f417509c00e6a25de7bf776ce5b44a86db021275fff