Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac608765b4051b9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 10:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c99d248546341f9adbd35c7131c4a04 SHA-1: 8dd617c60c7939900f34c83a5996cc7eb3af0065 SHA-256: bac608765b4051b97b9452df9c732c60f191b80f03a7255641462f3caf0729ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://state-lithium.com/upload/files/33683388580.pdf In PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/bukinonanavamowi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc045634---701973447.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/70863138804.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/sikoletesubebanepufiwafe.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/59637061442.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/38622675509.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/tuneb.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/fokulefememabinipej.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72820270174.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/15215060482.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/walurawi.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/4963221600.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10b65aaa4---wiludeledijani.pdfIn PDF document text
    • http://gojjang.com/uploads/files/32593836540.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/vonilivepadamufukaw.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/namoletepe.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210920_205244.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/69082454160.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/dowulubosupurej.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/67073815764.pdfIn PDF document text
    • https://ever-progress.com/upload/files/78258662010.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219111759442694.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xexivegob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=why+app+crash+on+androidPDF 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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 10444 bytes
SHA-256: 00ea183ac7585147538b32d4a687be09661bc4796f9f2d442c82a0417f2a118b
font_01_sfnt_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 17264 bytes
SHA-256: aab9c8764b16e3477c2cb9db7b2abd3f5f04cc3ea702858692e9c17fb63fa66d

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