Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba62512e818a003f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 11:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da03c6a8952adf93efa66b7398c4b80e SHA-1: 68c9c6a2f2c6aa64522e189221a8df9f27b6e4c2 SHA-256: ba62512e818a003f3dd3b0640aacb69705bb2820cd3a388df2d7261a670affc2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and ClamAV detection confirms maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://stavclearing.ru/upload/files/52638315710.pdf In PDF document text
    • http://motorlustor.net/userfiles/file/24365582984.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/98991610078.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/45802117243.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/sunozozoratofufepufumekik.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/makadiwokom.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/36649653803.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-30/20210930150315111797.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/96986259189.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/tefapuvumiw.pdfIn PDF document text
    • https://noclegsosnowiec.pl/eurostyl/photos/file/38237297163.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/225806630.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/96512597116.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/90805871329.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/18800034806.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/35738340894.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/92189f4893440a6f986aa7624d9b34e3/gozarofo.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/bemepubamekajeguke.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vna6g6oi56dv3lnoqlcgn85i4q/dizofof.pdfIn PDF document text
    • http://vaynhe.com/upload/files/wisigumiximusev.pdfIn PDF document text
    • http://hydrem.ru/images/file/75343596772.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/nozixegujagilojalud.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/bivazemalabutuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+top+up+apk+downloadPDF 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_off0000b32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 16044 bytes
SHA-256: a6449adae5d87bc41e90fbcaa978ff24600b07f1cf1201e19595862ce3bfefd6
font_01_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 10380 bytes
SHA-256: 6dc04903aea910ba8cad19c9820f3bc375d3e6d6112a0b4fd4db10be5e52da1a
font_02_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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