Malicious PDF — malware analysis report

Static analysis result for SHA-256 723f75795ca8cefa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 19:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0bf13e29e0a5f3eb9ffb794218bd1f41 SHA-1: b78d7606ce6323d1c1993bb1db68b5a01211024d SHA-256: 723f75795ca8cefa8336149148378a459248f08272607cd3c91cf9f96f18fe7e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external links, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=is+fortnite+free+on+chromebook PDF link annotation
    • http://everest-c.ru/ckfinder/userfiles/files/fivavovijujarekifedazeg.pdfIn PDF document text
    • https://music-group-store.com/upload/files/zukolireredexesus.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/werufugopegir.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/47818187492.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/jedoje.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/68029729219.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/46295809436.pdfIn PDF document text
    • https://network-italia.it/file/39022175428.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/63250506316.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210907_378B542C3D0DC630.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/kejoperanuraniwuz.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/49186836952.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/41372962613.pdfIn PDF document text
    • https://ratosatu.com/contents/files/1732480035.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/68452377598.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/sewavelotif.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/7716891645.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/takezetemuxanurisitu.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/11076392705.pdfIn PDF document text
    • https://yodobashi-church.com/pebitugesiwusotinipeboset.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/10347192127.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xuwofezazumukaj.pdfIn PDF document text
    • http://machin.kr/userData/board/file/vilobidakirojajivozuwofoj.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/fakekugafedulogebesate.pdfIn PDF document text
    • http://calisnt.com/uploads/files/widegarevezululux.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5ad32df8---41962722090.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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 18612 bytes
SHA-256: bc4260062aba9cc99f0a96177764adf49bac12ad80b86a2ba94e3dd507cdbd57
font_01_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 10576 bytes
SHA-256: 48ccbdb3a842d5be0934f4774b482abee8b2b080e804d42e1c522d3d8cf52dc4