Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b38699e9f52ec0d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 23:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e5089a0838ab39374031ce5a59ec4cbe SHA-1: 3dbcd9773fd4d58cd72d3ecb90668b6484a1fc41 SHA-256: 1b38699e9f52ec0d45b13287df8e77670a4e2aaa46c3f7a1b20940e849ffc550
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://brickchamber.com/ckfinder/userfiles/files/ximajupomozozopogil.pdf In PDF document text
    • http://apismorava.eu/docs/loxorekutixed.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/42507571287.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56166635897.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/42587725054.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/kowupivusix.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/gemuzizoxu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/37011212234.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/12922611555.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/74934980622.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/sozen.pdfIn PDF document text
    • http://vinmexindia.com/uploads/32404909777.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/89406257833.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/rigazap.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xiveziwitovumugukadow.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/5287711699.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/pemalokotemupidijokema.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/getonezojipi.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/vuvepiwavubepuvupe.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/21722512196.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/16000681472.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/dilexeteru.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/linajiwozuwenulamuxeb.pdfIn PDF document text
    • http://learningkey.org/userfiles/guwafabotatuxu.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/73862824815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wrestling+revolution+3d+wwe+mod+2k21PDF 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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 11108 bytes
SHA-256: 03845f46990df19ccaa4be06097fa3eeee799f695c89aac7eb371083d63208ef
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 19156 bytes
SHA-256: fc12d8e1525dc58a1bd52af7e05304490f4a1ca1c684faaedad1c3ae48fec808
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1