Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b50b220753030f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 21:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b8e1a13db8372b82551e0c6c8bb5e5b SHA-1: ffa50db7c5ac68eb2da27d355f81a913cf790cfe SHA-256: 74b50b220753030f8935772d127e73df2b72be7bd7ccb5cdbf154d34f37c0250
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded links, with one specifically pointing to 'irlanc.ru' and another to a link farm on 'sweethomedelivery.com', suggesting a phishing or malware distribution attempt. The presence of embedded links and the nature of the heuristics indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=the+grand+gangster+mod+apk PDF link annotation
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/43604726302.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/94224634113.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/jikanedo.pdfIn PDF document text
    • https://birotex.rs/images/files/93974330302.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/jepegoxomopafozoguxoti.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/58727688605.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/85889278149.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/fikoxiru.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/lemavunobujetusuwo.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/34962666406.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gamotidubizuzug.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/temirevejusatekiviwulefu.pdfIn PDF document text
    • https://carlojans.com/cms/file/futibivozejedazezijosidi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161498073acb7f---pepusogoxamodiziga.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109131624322722.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/xejanarevavuwaja.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/sazixuvozepudopijoki.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/93951571068.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/jutuzan.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210920_151728.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/gokopitiwu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/28394959753.pdfIn PDF document text
    • http://nemochem.cn/upload/files/38531813001.pdfIn PDF document text
    • https://subded.org/userfiles/file/8475494971.pdfIn PDF document text
    • https://wasael.com/userfiles/file/ribijojowevubo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc4165817---82794034061.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_off0000b7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 17052 bytes
SHA-256: 2f77136e39afef6c3a456a65242687df9009375ce6ffb71b8f2ba186b29b08f9
font_02_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10756 bytes
SHA-256: f33698a9adf9130b3e8f8d3ea20d9a618baffe8cd84a5e590af11d2d1b971e1c