Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cee8d1390ffdb5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 07:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b366fd4707d5eb4cc1cd385adf94a2e SHA-1: a7b33010f1664d8048a0b6797326d95a88b39169 SHA-256: 36cee8d1390ffdb5281e8da7a45311ea4121bd63c3e97466ee67697f04b5dbdd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to a large number of potentially malicious sites. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5084

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=qr+code+reader+web+browser PDF link annotation
    • http://preiswerte-unterkunft-papenburg.de/mediapool/fitebufula.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/86536334220.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/69208004928.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ca06c13c08d6a35885e7486b8a15d0f7/logalasalofo.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kizuropifuk.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/mogek.pdfIn PDF document text
    • http://lagrupacio.cat/file/gozilomifipiwuvoku.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/17/luketewud.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/80093366780.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456070a4d10---giwetugibavibawijoluxejin.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/54242553908.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/porudobivupeg.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/72493090151.pdfIn PDF document text
    • https://majubesar.info/contents/files/57864740535.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/vunaxuloruli.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/99618459239.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/dijuvuzemibuwewele.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/92441511294.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/2145417317.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/33137535993.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/93173889485.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/59779318460.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/gujari.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/pikiru.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/tapamofajomivukimej.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/29195522080.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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 10308 bytes
SHA-256: ac58c636bbfa40c4a9f8cbd6b774698c91db072b348c9df155ea8bcc8fc84662
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 17860 bytes
SHA-256: ea3f51b30335fd822780d006bf96014a4b93c24acea70bbb55b5b8d80449fbe8