Malicious PDF — malware analysis report

Static analysis result for SHA-256 174403a68cc93422…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 17:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4988d874cc5419af1e83069b3fa0761e SHA-1: 65fa50ec555fef179c1a4dfacecb8f8af67b27ce SHA-256: 174403a68cc93422e171d894f988ce0e95c190a452b3cd34c151489773f4f105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the PDF is used to distribute links across many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=thomas+calculus+13th+edition+instructor+solutions+manual PDF link annotation
    • https://0286869143.com/editor_images/files/ferujexeluvev.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d2c6a4c1ba8a877266366fa43326cf46/jinuzerolonif.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/biniwozomawidexik.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/77021881343.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/28215520245.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/funitezoreriwudiw.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/pomapimunubitoni.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/rowuduvubaxiwaj.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/zineselojezexisa.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nufotabuxenipozameropu.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/munegonivumidus.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/28147613523.pdfIn PDF document text
    • http://k1a.ru/images/files/file/95600493300.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/17004429670.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/83962639563.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/24609742434.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/99248130144.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/komifujozukudegi.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/84327362630.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/13689725558.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/38318872594.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161344fec44ebb---88541911626.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_off0000c469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC469 10920 bytes
SHA-256: cdce6bf5e8dd577516c2d9b53f42f0159d139e59bc7035315bd9a4ef55d89992
font_01_sfnt_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 17856 bytes
SHA-256: ffbe95960b54910d161b61abf7f0c79febfe2ef2f83c62b64a44e2fd6121d5e5
font_02_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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