Malicious PDF — malware analysis report

Static analysis result for SHA-256 639785e6e88c1d17…

MALICIOUS

PDF

89.0 KB Created: 2021-09-11 11:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9f2f646ead36ba835fd25509b54d4b5 SHA-1: 3b9487df663574bcb383f29d70471532531f58dc SHA-256: 639785e6e88c1d1783525e493292ca8d1bca6de2aa4fc8d9d1c30060ca5c253b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan. Static analysis revealed numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The PDF structure and embedded URIs suggest an attempt to redirect users to malicious websites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.1247

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://synerhu.ru/uplcv?utm_term=codigos+ascii+pdf PDF link annotation
    • http://stopguepes72.fr/userfiles/file/gikokodojaneveralababagux.pdfIn PDF document text
    • http://digifast.cz/userfiles/11057699497.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/kenonilimen.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/76535084227.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/livigasomuwapu.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/75162051379.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/dekemukewizamenuz.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/17104894356.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/97151287685.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/netodokofovupodozisar.pdfIn PDF document text
    • http://puisan.ru/uploads/file/47665872377.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nilonarekafumetexe.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/19735708980.pdfIn PDF document text
    • http://www.polni.si/Images/files/jalijakapekodivodalajiwaf.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/rugajujixojupekesag.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/21335225331.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/sixezazatoxilezetuxon.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/inmnlicj13kds22drashk2q8h6/24035485957.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/52415656047.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tisifu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/99567215361.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161329ac10b2cc---zaduzime.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/39623416418.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/58096683718.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/mazezilofowodumobage.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/65137601587.pdfIn 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_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 10348 bytes
SHA-256: 428ddc526a5c2a819aa35281d2aba0c23fc26039fc4060dd4ce7496fd0dd4912
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 24352 bytes
SHA-256: ba37920574fe370e1517ecdd7a8f29fbc4e3293b35a7406f63718bf16c62dd6c

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