Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab41e0384119893…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 07:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f28c51d0bdb3b1097359abbe3d72f65c SHA-1: 9a554e138590c9b3587c6f2ee4bf65dc0c4bd9c0 SHA-256: 7ab41e03841198932e212d3180e9be7259e463c85ff8f6a76b2f185e70708faa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=watch+true+to+the+game+2+online+free+123movies PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f733a19d44---semisisibuzolobuz.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/47631838593.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/kafimekisududimasidifa.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/jatetezufaxojidakijon.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35490313e---motul.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/41215441679.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sitikogalotadarawofijuji.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/65112700293.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/13284491998.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/12078652179.pdfIn PDF document text
    • https://argumentua.com/i/file/lidemewupakibogopox.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_051269673D293BC6.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/jikekuvegorevononorul.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/2191640910.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/48036814328.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/24557675095.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/77228587609.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/tudirobulodejokeganezif.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/26090413724.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/ginunewametasotidig.pdfIn PDF document text
    • https://12shio1.com/contents/files/42903061848.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xoviralimutupem.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/2743514741.pdfIn PDF document text
    • http://safarang.com/basefile/files/dapojipalozu.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/zudigarevolorasituxadu.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_off0000c0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C3 17712 bytes
SHA-256: c52f5d84fde947f3b1607d9944d61881f98bc4091c1d117d50725efa87f435e9
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 11288 bytes
SHA-256: 41cabf28c3289b5ac212149d1c4601035d55b5e51558687f7b1be7f72105cad3