Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c6dd5f63de9157…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 15:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 740be7f1f824b615dfcfc09295e60c9e SHA-1: 3a16957aa9ffc3a82a2ced5ddb005da1dc045538 SHA-256: c4c6dd5f63de9157de3377b3bb35dbd32ce725c2048e1732e29f56cecb718c8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to link to many external sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/73612671164.pdf In PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dawiveli.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/derika.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/51293430036.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1535c1d81---fizewakapajuxufaweno.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/64748853157.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/te5g86iobl1t59vqae1773n5i1/83827382810.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/zapovexotibowajinurojoj.pdfIn PDF document text
    • http://recviem.ru/img/upload/sewexipesolubazajobi.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/nudaxen.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/62789496001.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/nuxiletetoliw.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/dovumupubukesi.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/89077935439.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/vujavabuv.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/78665510262.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/71137610257.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/6965736836.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/91288227790.pdfIn PDF document text
    • https://cartolmania.it/file/1815050773.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xulejepomesewoxefebi.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/fubexosinunitene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cupcat+editor+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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 10648 bytes
SHA-256: 82f39820617eba2ae5c32f17ec937998e79f85229a35d89ffa6f5a6b018be9bc
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 19256 bytes
SHA-256: 86f85510be6dd05f134309e8f43917537216652e7acca002c0ad26ce5e954f6d

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