Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc0ce8ff40ff11c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-23 16:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bda56937b1bf76fe841041defb02becb SHA-1: 25f52c3e6720e16e411da415f2e8e655ffbee72c SHA-256: bfc0ce8ff40ff11ccd9bdd6d0b538a93d74ac009f9105efac4842eeaacddc23b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the document's structure as a tactic to distribute links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613477c2bdc0f---58217031078.pdf In PDF document text
    • http://ros-grad.ru/fck_editor_files/files/lutip.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/xewifovukowo.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/jarabudizabazosaju.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/6728343715.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/43073424394.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/14886989216.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/nidugutujowuxo.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/topoxorazu.pdfIn PDF document text
    • https://baglab.pl/galeria/file/27215190110.pdfIn PDF document text
    • http://allier-genealogie.org/File:/vitokutop.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/13906125798.pdfIn PDF document text
    • http://kodemari.info/data/files/44802214054.pdfIn PDF document text
    • http://citty.org/images/uploads/file/gawomazabude.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/78390126514.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/mizimosifewaguwefapewajew.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/baguzevuri.pdfIn PDF document text
    • http://test-immo.com/file/75751797461.pdfIn PDF document text
    • http://snsi.jp/image/news_file/97386443286.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/99148084981.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/61402217225.pdfIn PDF document text
    • http://destockbaby.com/ckfinder/userfiles/files/figewalumiserozidawo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/de593187a05d5b29970c85ee1c44cd57/kekekefuxelozepipukoveniw.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/10319663607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+mohra+full+moviePDF 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_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 17520 bytes
SHA-256: 64164f450e57d5b06d110b3958812b857569ea1bf0895948c37fb8ce26c90948
font_01_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 10488 bytes
SHA-256: 2efb6dbef8d3cb88c245f36bd7b6029ae798bccf62fe352b0bae440a22a9a3b6
font_02_sfnt_off00013b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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