Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6524de84ee0552e…

MALICIOUS

PDF

82.8 KB Created: 2021-10-19 01:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 401a93775cd118cbf64d9e305b11915c SHA-1: cc1b0d19026092fc26e62bc8baba21e1e834aa09 SHA-256: d6524de84ee0552eb29ff244449b9bd63b0c862599e44f5518d437e531c73b68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm designed to redirect users. The presence of a link farm and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614245d22a324---69827741253.pdf In PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/15027804470.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/54342383239.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/97795313728.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/95878340836.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/rememunepovuradaxafenotu.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/30998445918.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/33028976183.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/wezaxuliwuju.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/totuvukinomolipogesarajav.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/884051050.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/19520658957.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/liliposabexopilajakog.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/daxejimiwes.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/vazarodomilibuneba.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/wubetakapivufomaxemozi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/21938795638.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/moxunukisesiwisemezamufo.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/40746298091.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/131216257540.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210930_8C41DB6257052FC1.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd93738e89---6645537883.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=download+subway+surfers+rio+mod+apk+osmdroidPDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 18412 bytes
SHA-256: aaba7f6e153652bdcd2a966c2505068dff93799a7b650add39e7ab4f0e9a0893
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 11096 bytes
SHA-256: 0b2e40d2eabe7844bdf47ab1c0f955869f74225d417ddd1c550aac49b9eb77d8