Malicious PDF — malware analysis report

Static analysis result for SHA-256 b625482fb5467150…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 19:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae06fbe651c1625cfc2ccaa431511570 SHA-1: 0d805556b4cd8b5e9b50e94bca3625acfcd09aca SHA-256: b625482fb546715051b6d8f8ffcc99fe6c7d2caa7eebb489302ec98d89f48a65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to a large number of distinct, potentially malicious, hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://mlead.net/images/e/file/71730247572.pdf In PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/netovadedosareri.pdfIn PDF document text
    • http://netart.hu/userfiles/file/tatapibebalereniwidireko.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/70391085869.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/53215238365.pdfIn PDF document text
    • http://speckrepej.com/upload/file/dusulewozodugo.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/giniputubozowelejamofo.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_F704098955DB50CD.pdfIn PDF document text
    • http://spakimthi.com/upload/files/2732617643.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/wogaboxubovunarenigazodo.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/bifemeja.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c41f12bf8a---50293529674.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/95908451388.pdfIn PDF document text
    • http://imoroz.by/upload/file/rijujoworexurufafodur.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/51428578224.pdfIn PDF document text
    • http://topas.lt/userfiles/file/dejulazosarakonu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/58171723058.pdfIn PDF document text
    • http://www.77ice.com/upload/files/56195511782.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/sibojifakoto.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/14962737943.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/jorevegaguvipefu.pdfIn PDF document text
    • http://corkpotters.com/images/gefilokebezipu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/34250319632.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/rebegitesodamafilifilef.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f417599ad8---98970436852.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/ripan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kodi+wizard+builds+2020PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10528 bytes
SHA-256: 7c53563723836e84e70bf98a507431544379c6b64e16cf0a7608cac9d1554fed
font_03_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 25164 bytes
SHA-256: eed83e319cb892f4aaddfc789c61d27b1fa690f532a739684424e016470fe32b