Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5619be403bb6868…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 11:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3232dd9a8b1c0d7cbaae5eec1dbed686 SHA-1: 3d371e5f4fd40c414c7092ff51af0e1c74a990ed SHA-256: d5619be403bb68682ddbcd5b907e054867ff4babe26f0e034a9905b241f49172
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://grubstreet.ca/ckfinder/userfiles/files/kugovoluf.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8729b8761---12894941021.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/xefujosetumewud.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/sakisa.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/97143101699.pdfIn PDF document text
    • http://rld-carbon.com/file/48701030448.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98433418927.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/revibijosefanogulom.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210912000616.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/62555471851.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/xanekevomemib.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/8622831625.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210908080548.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/fanegevexigofulorakub.pdfIn PDF document text
    • http://whatdwellswithin.com/file/zuvuzotoxerexovisujo.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kimukarolezexe.pdfIn PDF document text
    • https://braus.uz/images/shared/file/11208173785.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/98756781569.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/lubalaregiseju.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/9991982967.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/21775821186.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/44517815695.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jiwejawunoselikikub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=view+page+source+in+androidPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/61437320967.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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 10700 bytes
SHA-256: 077e149c9a8e969ce9c259abe1b264ea5b99d7796c42a2f0b1daad77a7ee4911
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 17984 bytes
SHA-256: 30e6c584f1d551cdfcb60dde895da8afbcc6d38692cdf2288796b80e2e4591e7

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