Malicious PDF — malware analysis report

Static analysis result for SHA-256 827a78b48cb0dfcf…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 15:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c814a7dc0df057e469261fd66b897365 SHA-1: cd498bc627d88add040d472db980e4f7b5bbe6dd SHA-256: 827a78b48cb0dfcff4e44e8781c54327ee28cfecc898fb6125e0a00082073a5b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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.
  • 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://tramtron.vn/uploads/files/files/77681440976.pdf In PDF document text
    • http://kokocurry.gm/userfiles/file/tulajupuweridupaki.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/80627843056.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/vanigafunamepefates.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/10717516013.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/15361411214.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210902_F5B70196A74D7545.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/guzasovopeki.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/68275620248.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gizoxulupakinefab.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/90498432552.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/81195120637.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/jutifawevetigeduxuvo.pdfIn PDF document text
    • http://client.diffuse.info/files/68266918339.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210909_27D7350BD1FE1ED4.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/82599364102.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/90079244250.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/77794593138.pdfIn PDF document text
    • https://pr-dienst.ch/file/romipepulode.pdfIn PDF document text
    • https://fong-cai.com/upload/files/9064238517.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vakdigid36brgs3b4smr6t4669/59146602212.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/nufomekam.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/75887003537.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zokimezuredolodi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4fcfe6ced9f745f7e3edabcbe883e7ce/98355264828.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/73487798937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+emulator+for+pokemon+goPDF 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_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 16744 bytes
SHA-256: 2136f9e905f22b68caf67ccf0cac40867251fcf8f3f3d4628cba792c04f2eb2b
font_01_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10848 bytes
SHA-256: 2b9dd4d9fc8c4b011739ca01db81c5986010ced900f5c21f257633e2d211236b