Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d78c54954e746cc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 20:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 238802a1777ca06dbfa5100e44157b7e SHA-1: 3fd30b1039d10d1051cf8884877bf531d3d8d37d SHA-256: 7d78c54954e746cce82cef163375c7cde11f05169ab588c652b244ceffa0a477
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a Trojan point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=genshin+impact+farming+primogems PDF link annotation
    • http://jolanyee.com/upload/files/202109110025322946.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/niwesisugiwuvezu.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xozidobikelu.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109080927065435.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/69866868029.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf61a0fe---23996630679.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/bivijalexirewixuvesis.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/disijuxebot.pdfIn PDF document text
    • https://wonkingchina.com/d/files/kepexudapavoxebavuwove.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48370154759.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/96339615223.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/55912950951.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/71185818956.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/gidafawuremumojimozo.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/patid.pdfIn PDF document text
    • http://swhos.com/upload/files/50755101539.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109122135405075.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/nomolofalobirivena.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/sejawexavup.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/zimitijiw.pdfIn PDF document text
    • http://gespk.com/userfiles/file/55006928183.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/41849888776.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/11672fda7919db190bf6634fe65aaabc/nojapebudupabidirotebajor.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/70808836949.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/fezekajowazexovu.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/nibijudugebasuvisis.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_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 17688 bytes
SHA-256: 7eb3310c8009a4d0c372ac2ba60128700d10c7856488f494bc399041b750ef04
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 10920 bytes
SHA-256: 2905f2af565bd32eea4846045efb3739c66c0eec58552d5ec8987d0388e420f5