Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9502584b1c772f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 09:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9afa4ebef34464a71a8088572fbc98db SHA-1: ba4685bb39a94bd8e8a69da4b74c2d568b3a7f3d SHA-256: 8f9502584b1c772ff96a8545c0bc004f826ff389862ed0b7713729578fa949b3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one pointing to a raw IP address, indicating a potential phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common pattern of using documents to host links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://symbolfoods.com/files/file///vurozonaz.pdf In PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/juxejixubigipil.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/50073999494.pdfIn PDF document text
    • https://olterus.info/contents/files/70967970188.pdfIn PDF document text
    • https://simorgh.it/uploads/file/20311011382.pdfIn PDF document text
    • http://17njl.com/userfiles/files/zirix.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/15014633629.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/77028226291.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/duwugelokav.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bawuwebojemuvopufuzixe.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161349ba635437---13724084685.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/xifaj.pdfIn PDF document text
    • http://qdjshg.com/files/file/91354342964.pdfIn PDF document text
    • http://52963566.com/upload/file/202109011251069794.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/tageviboteli.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/82846021459.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/49948600022.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613983e4af18e---63876522721.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/kawetedupoloneminuri.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/zudipanotine.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_175434.pdfPDF link annotation
    • http://perksys.com/userfiles/file/85420513025.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/72274282091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=live+net+tv+not+working+firestickPDF 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_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 10504 bytes
SHA-256: b145b3aa7d2cb1e96493bdde9d4c3d76a8b3bddf969b9ef30f02536fa39bba7f
font_01_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 16976 bytes
SHA-256: 922c7bfa085a9bc78d64df4eb5f89bd36886dd8fa88232010b9ac9ad37774e3d

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