Malicious PDF — malware analysis report

Static analysis result for SHA-256 8251e153f758ee35…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 06:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73f20fce8d70cae1198237e64775daf6 SHA-1: df8cb8fee0fe6fb9e4bef9c228777712b0529b6e SHA-256: 8251e153f758ee35ea92795c7f85453cedf1d4c5e8e6a91fb711646aec5a4e70
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into changing payment details. Embedded JavaScript streams are present, suggesting potential exploitation or redirection capabilities. The numerous unknown URLs point to a link farm designed to host the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://karapinarinsaat.net/userfiles/upload/file/wodujog.pdf In PDF document text
    • http://beta-rc.com/upload/files/poxapoduxepeginu.pdfIn PDF document text
    • http://taxfreepoint.com/file/71431719040.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/83026837685.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132612c7fc65---makizibumuz.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109110006598400.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/kirexik.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/65550221038.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/77794376051.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/bedajosaluduwulaf.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53396be81---82769935721.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/59713791083.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/98119035306.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/losilibabozedafekivefu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tumadenajerepoturutobe.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/savuvigofosimutafupagofux.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/52686927431.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109120621282139.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/26832850057.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dagolosiganubugajum.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/zinusimuwi.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/pamusuzanamipulowumol.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/pamesip.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/wasimuforetiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+see+the+photos+of+a+private+accountPDF 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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 17976 bytes
SHA-256: e0e3f5b5e0f248ef6d69fdf4f3dd4979da01a51fe9a86f85796ed4022b09f851
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 10776 bytes
SHA-256: a1aa429776df782a60543ff3a7243c2aff5b5139a16078b9a3ea46e11435810e