Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c2e2e287244bc7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 13:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10a12cc2a668317d0edda18eefcffc32 SHA-1: 16ecf5681b03dad3eb18e2a2aad3fd870ee47d80 SHA-256: 13c2e2e287244bc79ed49f6ee0c1aff469dad53d5fc05a7016f4633241ac2fe9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stopguepes72.fr/userfiles/file/62894341373.pdf In PDF document text
    • http://cafesezony.ru/fck_editor_files/files/19027222587.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/wemobedusa.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/gemoxaj.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913200029186307.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/wifaremuzifewifo.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/gureraledugati.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/rexifurumon.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/80526041936.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/lezakamuwuzonimofewebo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ada8161d---54160471530.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/35387669627.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/namimezusinemeromunuduwet.pdfIn PDF document text
    • http://hexindechem.com/upload/files/89544348544.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/20152800181.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/78599902036.pdfIn PDF document text
    • https://securitydm.net/slicice/file/35066648868.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nozoxonegule.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/47067005432.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132fef7f2f36---38238840780.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/41674385325.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/33160686933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=remote+access+to+another+android+phonePDF 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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 17620 bytes
SHA-256: 8268f1c2f14fc1eed7b508b2ef275b4b236cafddeb6625ee9e864d73956b7b89
font_01_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 10780 bytes
SHA-256: e07de1fc8152805c632f204e40d9ae49662cdfc37708e15cc112cd70f199714c

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