Malicious PDF — malware analysis report

Static analysis result for SHA-256 45861132c48812d5…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 17:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebbf9a6614fede7a370bffc0de3e5d51 SHA-1: 3c8676c0a7e464c37e4e304bb69d9762b7c62cec SHA-256: 45861132c48812d511fffe8a6c4e616a1473052d857c97518799d308dfafdc37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure strongly suggest it is used as a lure to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=poco+x3+nfc+vs+mi+10t PDF link annotation
    • https://electroagro.es/pub/files/xetivamotibivuxeluwifire.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/38487496046.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/taroxoroxomizelijed.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/48945280669.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/baduxavixojekosafogu.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/genunovidav.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/xomudulojuridarufakajip.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/jasizivifakuputatafodoz.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fitevukimeleze.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/394f0fdb00989dd13bb29267adc5e498/78888249013.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/dubodub.pdfIn PDF document text
    • http://skisun.it/userfiles/files/nodasexopuzukifunak.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/l3o5jlae0p1rrnk3q8mgekjp35/tetokaju.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/logewegikafese.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/61797782953.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/55425806797.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/tokegu.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/ratiduvulofuwo.pdfIn PDF document text
    • https://comfort8889.com/upload/files/liloborejexesamovaxufi.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/53790206283.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/47430785957.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/86529363060.pdfIn PDF document text
    • http://espokebar.com/uploads/files/warurasepabaxekam.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_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 22212 bytes
SHA-256: 0ceea6a73cf9e34d497559d8fc4148cb90e2a7185cc01568d01bc508f8414d72
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 10572 bytes
SHA-256: 628b07f5bb4ae15a99a43aca11f23c31a01fdd1a3465f030d9c8799faceef804