Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be9d288847c606e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 15:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11cb40b1724fc5290c4fa1a1acd7b38e SHA-1: 1dca25cd7d10e0d2965b1c188113ee13cfdb8b01 SHA-256: 3be9d288847c606e3a15be77d00fb6786c3e8d68ce70d29aff796de7d24906ae
126 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. It contains numerous embedded URLs, many of which point to PDF files on disposable or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of such domains for hosting files. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection results point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aksaaydinlatma.com/img/editor/image/file/41668933547.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74487052827.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/lixubedogagotofu.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/sawunolemawusurusovinazen.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/piwaruxilifokowakegapiret.pdfIn PDF document text
    • http://iviltra.lt/images/files/xodegefupilor.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/71735656794.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/73780855505.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613077ff67bf6---94438054358.pdfIn PDF document text
    • http://julianina.dk/upload/file/41504919247.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/28031161832.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/dogola.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/joginigafuwiwegotodum.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/46168736833.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/98935531343.pdfIn PDF document text
    • https://angkalaris.com/contents/files/lekapodepivabevob.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/5086378290.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/zofimonewonugetel.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/pozika.pdfIn PDF document text
    • https://sainaudit.mn/File/26238038082.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/41413626273.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109070644056919.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/59533026837.pdfIn PDF document text
    • http://retailcop.ca/files/peboduma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gloud+games+apk+2021PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 17648 bytes
SHA-256: 2f9b71d7865d5c063659bd7083612addb21cf6301ce373feb0ef4684b8450b7b
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 10864 bytes
SHA-256: 4cd0d2f44f5688239b10d59ecdbbc9952f9fd0490667d0faa17e7bf226759845

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