Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d149cdb026c4636…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dec56299489f2e0be6ff5f2f37a04ab2 SHA-1: 310dec7e8a5b9108422a03a8478d5f561582e230 SHA-256: 8d149cdb026c46367231f2022d0a1929341c2c9ad6cd32611b6d2f657fae61cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm used to obscure the true destination, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • 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://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/64960678765.pdf
    • http://gzhangqin.com/uploadfile/files/87368825220.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4trgvo55ns4jknofh7ju10gsre/22928116348.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/juwefuvipifififofinop.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qhs8ttiil59ku08ncvo94kc20d/mavobaxegu.pdf
    • http://driver-jazda.pl/upload/file/nigadi.pdf
    • http://chapelguild.com/images/usr/xaxunisorogorowugavof.pdf
    • http://szjwwj.com/userfiles/file///rikenow.pdf
    • https://bedandbreakfastchia.it/userfiles/file/kisatikoxajakatitelif.pdf
    • http://www.lnk-creation.fr/upload/file/92669552644.pdf
    • https://blv.by/upload/editor/files/tefijakipulusat.pdf
    • http://educasters.co/ckfinder/userfiles/files/396713525.pdf
    • http://inbiosa.eu/static/cfiles/files/36578615466.pdf
    • http://consulcongress.it/uploads/assets/file/xixiseteleb.pdf
    • https://bcbc3399.com/upload/files/gusuxo.pdf
    • http://instit.ac/ckfinder/userfiles/files/kamidalalibim.pdf
    • https://peltonfell.org.uk/ckfinder/userfiles/files/46658330734.pdf
    • https://anninhsieuthi.online/upload/files/jaxokosefopekudikapu.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/34685652591.pdf
    • https://xn--interpeas-r6a.es/upload/files/60050374973.pdf
    • http://ryanoomen.nl/uploadimages/files/pifuxuranapefu.pdf
    • https://profitaler.com/UserFiles/file/20108006396.pdf
    • http://maihome.hu/admin1/file/taxibuvunelosenevazirad.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/40759531590.pdf
    • http://coolscape.info/images/files/kemaxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+city+mod+apk+new+version
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2d.bin
84e6180773e871e86c0da421e026a5cac71e85fe93937db39587d268b707251e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 18320 bytes
font_01_sfnt_off00010b49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 16792 bytes
font_02_sfnt_off00012360.bin
b64521d14897ce3745eed3a85cbdeb258732338b4840fe7391201b92eeb36455
pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 11172 bytes