Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe6cdd67db0e91d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 06:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1875f044a3f92d8fc903021190867caa SHA-1: d68de81e5db1d749c05e3f8122feb1625041b538 SHA-256: dfe6cdd67db0e91dd977187291c49f85220babb0cdd80469206c17785f0610d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=rujuta+diwekar+thyroid+book+pdf PDF link annotation
    • http://flairpens.ru/uploads/files/47146241021.pdfIn PDF document text
    • http://kccmaul.com/files/files/81626703258.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/62090055702.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/wezumaworarumodun.pdfIn PDF document text
    • https://spacio.hk/attachment/file/sevitexubemaguvezojif.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/26508299951.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368757989d7---nogizubibimufebetomib.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/79816968917.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/vogilufo.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6133CA6085C94.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/14664819291.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a0b6f2e5---pifedujufawogunup.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/68185586849.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/vigamutujoxegalirirofel.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/7804416281.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/besukadiliwenomof.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/54738674851.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/wadotumidigip.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sepumaruvironarovanezaru.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/55518183579.pdfIn PDF document text
    • http://dytac.hk/userfiles/60338675536.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xilabujafeved.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_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 10984 bytes
SHA-256: fdbd9281882d430aeb7ad41ad4fe18fef53a6d85bf184ab8b7613046f471dcf8
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 16736 bytes
SHA-256: c9d709ff86bf2190e2bc94fc98018242a660b76e76e6a14b915c94d8b732c652
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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