Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc8f89bc5e08c1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 17:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bb72b75d39c43346e98f5440019f1cc8 SHA-1: c54ab10fd71e469f870e0160e3970f988ffe44e5 SHA-256: 10fc8f89bc5e08c12b8b6dec1fe45ef84f741d75ce58aa274ee9af8ac5938a3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support maliciousness. Although no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ubitanduk.com/contents/files/67184508656.pdf In PDF document text
    • https://securitydm.rs/slicice/file/83196268755.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xunifexat.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/6948147734.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/16658524273.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/50929537954.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/16197890196.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/jumijinalokopumifaw.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/4249988717.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/84333003292.pdfIn PDF document text
    • http://apart1day.ru/file/bigovo.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/loxejatawazunogetazaza.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/fotikulipepolenu.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/96905302312.pdfIn PDF document text
    • http://sswjeans.com/files/47904284406.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jojogepudoxoravoge.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/fovasabijeruvabozozebogod.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zaxidudelatobi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/81170003216.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/28857929239.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/15593440484.pdfIn PDF document text
    • https://edarky.net/data/file/29906000441.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/jofumedelegib.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/bazuxe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/bilojomojoxali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=world+cricket+2021+download+apkPDF 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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 10804 bytes
SHA-256: 1a7c70f740b56c1aaad0db42cf9c4b0cdf2dfa6d4d7ac6f8401e776f2fac69ca
font_02_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 16596 bytes
SHA-256: e29579842498b918226b6f106c3f3c0cd60a1db882df22daa455dd377379a146