Malicious PDF — malware analysis report

Static analysis result for SHA-256 da87c33750878125…

MALICIOUS

PDF

81.4 KB Created: 2021-04-01 22:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4bf11f88839d468d5dc3ab498306c2b7 SHA-1: 3c27c92a65ffc6d6e62794f70cb93757cbc314b0 SHA-256: da87c337508781258e491f55f01017f06bfb9d39b1df5b089de24f1ae5b2b25a
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains invisible links to suspicious domains and employs a social engineering lure to trick users into installing browser extensions or updates. The ML classifier also strongly suggests maliciousness. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of external URIs and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://seumenha.ru/award?keyword=pwc+blockchain+energy+pdf PDF link annotation
    • http://yeswins.space/xexebabobolebuxepowoguppp03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490930/normal_5ff8907d0965d.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/BifBhib/ski_shop_frederick_md.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5ff1204a3a56d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_5fe5e389de621.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/samsung_ubd-k8500_remote_appaaojf.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/jeslgc9/66939206593.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/jovFpL0/97130184011.pdfIn PDF document text
    • http://idealica-it.website/54112970147qijci.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/geggxCE/didonidaposomoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482012/normal_5fda8d4d76849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_605123a476c9b.pdfIn PDF document text
    • http://setefigidoral.iblogger.org/cedarwood_doterra.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/final_fantasy_7_remake_episode_2_ps51twrr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_600badcaa449a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_6062d165b78e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_601ba7c9e87f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5fdde75806200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zonidagaxa.epizy.com/time_attendance_system_installation.pdfIn PDF document text
    • http://fevejalamozek.epizy.com/maleic_anhydride_production.pdfIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_27209fb69b844c4b8a35c99cf2fac685.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_54dc35465da24f85856bada146395d58.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_7fb40cb52a73458e908e35d90188b772.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 5348 bytes
SHA-256: 52de9a449affd9cbb84b12c7800e46dc53f2918ff42461b7be9680b3184b0f06
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 11388 bytes
SHA-256: 226ac43bf1f9c7fe59d3c8cc689f1b70365514e09080e856e2dcc2af49b77b1e
font_02_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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