Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f2cbfe83b64bbf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 09:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 068df8e84380d2c342b9c57167f22b87 SHA-1: ce7dc36403d8318b60a02847b3cbfd0c2de761ca SHA-256: 33f2cbfe83b64bbf62c9eaf04ff51bc720b95dc6d39c2ff8a53bc1ed4432862f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'ML_NYX_PDF_MALICIOUS' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=streaming+deadpool+1 PDF link annotation
    • http://www.sudeshnamaulik.com/fckimages/file/50586239495.pdfIn PDF document text
    • http://deltools.com/userfiles/file/41034845601.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/zadikixesipemofagozexijub.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/21817291881.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/55256537046.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/zafuduzawapi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365231c2f1f---99344590359.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631181363.pdfIn PDF document text
    • http://matras-devison.com/upload/file/xikovuferetizozosulu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lorugofitizebaj.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/lowulezawuwabimivute.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/kosinelivevesotape.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fidosipugewaf.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lusizewisav.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fozajuxurodukifirige.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/19985778977.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/wixotesar.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/vavinil.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/dororijubidi.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/17937214103.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/73879022842.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_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 17520 bytes
SHA-256: 74765f342312ba005c09c0ace097be84c144cd1cda2c851c4546f3557e7bbb2c
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 10696 bytes
SHA-256: ec31478e168bfe68d3ba629b01262916e660dc22fa43014f52c76b7026b8d086

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