Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b918f52b951743…

MALICIOUS

PDF

56.7 KB Created: 2021-09-27 21:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee07785c16e8fc63856bb50bc1b3d1a5 SHA-1: 7d517d1c1b377c3a7cf5a46b5381349461765fa7 SHA-256: 90b918f52b951743c3b4127ca2c74d4374313c2e84ba74b0c37aa729fe59dbc5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into downloading malware disguised as legitimate files. The presence of multiple external links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7635

Heuristics 4

  • 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
  • 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=five+nights+at+freddy%27s+2+android+apk PDF link annotation
    • http://graviroz.hu/ckfinder/userfiles/files/88406805292.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109230803143773.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/voboxat.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/78907854335.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/40331140702.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/86508805165.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vumukifuzoluluja.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/jupuwifilanuzesoxutosopid.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631491253.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090205344170.pdfIn PDF document text
    • http://tabletopad.com/images/file/61476451665.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/31851836139.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/relofonapagisuw.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/32478773210.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e144e29dc2---gepegesa.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/dixizojonizusesabetibasa.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/xomufumematariguk.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/37049777370.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/19306323023.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/77086992281.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210924142158_991161.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/93654617730.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 11132 bytes
SHA-256: b2353db7ec50b8735bc647f0717b85c03b22ff6e82ae13246c2a407aa9e83fb1
font_01_sfnt_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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