Malicious PDF — malware analysis report

Static analysis result for SHA-256 64baea5a63cb846d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 08:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4d1206d68c9abc11ae76d466ecf305b SHA-1: cb173051df88c56e1223c1f17e7e11b888a33c23 SHA-256: 64baea5a63cb846df9f4208d7da6f63d0c856176bb3c151c3c16a9aacc7a3a8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to other PDF files, suggesting a phishing or redirection scheme. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://amatnieks.com/pictures/image/36051546785.pdf In PDF document text
    • https://rumputhijau.com/contents/files/tevoda.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/49640153445.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/sasorukobor.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/gogosanekome.pdfIn PDF document text
    • http://moristas.com/userfiles/files/tobusatu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01366a6d1---wukupaponazasa.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/mukuvinim.pdfIn PDF document text
    • http://metall-press.ru/files/gudefovomulefadurura.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/60750749251.pdfIn PDF document text
    • https://highrise.pl/file/14709516177.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/runagopaz.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/99691418953.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/63076393886.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/54006927860.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/70239171770.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/tugiso.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/55305396505.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/vujawaxukuravugale.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/vurimadeserowuzuput.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/80658863441.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/14314728222.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l417blnnnlckt7b7vbgbi6etke/potavat.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/dilarosugosonisav.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/lekeleve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=counter+blox+cheats+2020PDF 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_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10852 bytes
SHA-256: eee2255bdec970d06191bedf31bdd745ed4433f54cf03f444349cb8d2e3ae58b
font_02_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 17552 bytes
SHA-256: d8b4bfcfdf8bcceaabb4f2fd17771c55b199b6fe8608e87df2d37c214d9f6308

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