Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef980c80107b25a…

MALICIOUS

PDF

96.1 KB Created: 2021-09-17 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1db33ba537c69c78326f48469737478 SHA-1: 5e130eef9fbf3fc6d5a7f5edf2250be51c412aaf SHA-256: fef980c80107b25aecf47deb0b0febec26a1d2d9a544896e1146377f74d88e31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=zack+snyder%27s+justice+league+is+gray PDF link annotation
    • https://thefertilizerequipment.com/d/files/97599129608.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/39093120142.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/2226962065.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/79255206843.pdfIn PDF document text
    • http://halmar.info/userfiles/file/44238537198.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/murovukaxasunozasexo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/gazozufe.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/sitig.pdfIn PDF document text
    • http://cartopack.be/Images/file/wupizilekonipigiwunapu.pdfIn PDF document text
    • http://sdes.in/uploads/lorasonejefivebetetak.pdfIn PDF document text
    • https://mkart.it/uploads/file/79654061245.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/44454356667.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/rugigunurekufefunom.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/tazefavolawijumivekin.pdfIn PDF document text
    • https://nomortiga.com/contents/files/kubezimez.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/95414890220.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/tidipalodipaluxefelaxeja.pdfIn PDF document text
    • http://archbot.pl/files/file/59916118651.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/fuzepuzipaduj.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/91794424627.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/wupobikezolilodefa.pdfIn PDF document text
    • https://rubfila.in/files/file/gitofisiri.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/16341144320.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/75724229571.pdfIn PDF document text
    • 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_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 19908 bytes
SHA-256: 57937a0b844d344095e60bc648327f745642298e151e4f7700486cbcff461fdd
font_01_sfnt_off00014177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14177 10856 bytes
SHA-256: 48eeef646633eedf19affac707c054e000d441162c890c5945da99f3e761f7ad
font_02_sfnt_off00015a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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