Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d85070b2de9f6c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 18:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07e9a560e5de07f23aa4dba0f5af96f1 SHA-1: db2ef4597a18ad27a12c280c8e4a11149366b5cf SHA-256: 62d85070b2de9f6c24e717256caa493b57a4ad981e3590af2b8c51e5e0ddb601
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, indicating a link farm designed to obscure the true malicious intent. The ClamAV detection and ML classifier strongly suggest maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards techniques used for initial access and potentially further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://aiswaryamatrimonials.com/fck_uploads/file/boduwik.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/36391948766.pdfIn PDF document text
    • http://nessium.net/userfiles/file/33625392110.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/nikesoburore.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/74751335459.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/95380944305.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/10640434549.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/ripeputi.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/zupodosoxa.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/patowogojexifo.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/jezaduxuvegun.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/20099813765.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/zesapomekilizixop.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/91314674944.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/pogiwukexulo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/7210418760.pdfIn PDF document text
    • http://perksys.com/userfiles/file/34666152977.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/rifipoxivebogorabipav.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/tuxuxuzuzamivu.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/surezesipomivimubalidote.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387407e8d26---vasajirakibagideridi.pdfIn PDF document text
    • http://happy-land.hu/editor_up/63264285604.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e5ec099ecb00d3c9b2cc0bb8e199d6d8/defalebo.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/norowu.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/10524824151.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/komawovevawibawop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=facebook+katana+apk+downloadPDF 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_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 10440 bytes
SHA-256: fc3bdd527afd7771bb3c0c6cc3548899810650f1c8919cf771998eb4344b4c28
font_02_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 18580 bytes
SHA-256: 27d5009cc0c4a94e037dff87af126129aac044148ad4925446d53028ecaad638