Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aa06e0ffa77075…

MALICIOUS

PDF

80.9 KB Created: 2021-03-24 13:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 96194a1df582818a24514279225260b0 SHA-1: 5e5da92c7721093b0557a457ffb15e6de3b37d34 SHA-256: c3aa06e0ffa77075a1cfd4e1e8fd4bddc85ab156d4b05c161c12d2443170d1ab
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/wix?keyword=cleveland+thyagaraja+aradhana+2020+schedule PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fecd4bba84b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fefa618869da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_604224639d691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495974/normal_6000731072469.pdfIn PDF document text
    • http://datingsexchat.site/6411494050258gqm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456728/normal_5fceb20da73af.pdfIn PDF document text
    • http://micrometerdigital.xyz/92604325802q76f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_b1368c3e574044e4a9069bfbae71c8a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/335f6240-7ef5-438e-a75f-13fd7507739d/zikenezifatewopivenaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c2c586-ba79-44bc-86df-2ac9a9a33fdd/loximozewopogeruxisafodut.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/38899679274.pdfIn PDF document text
    • https://c3e9b54c-2a54-408b-a6b9-e2f8ab5a503c.filesusr.com/ugd/136d07_dfadf7aee2e845e493c2d6335dea27f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9277bd8b-4efd-41e8-8332-a37fa20a1166/patton_heater_puh4842m_manual.pdfIn PDF document text
    • http://noratev.myartsonline.com/architect_s_studio_companion_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d570a3-fb63-44ff-913e-a192d69cfe43/difam.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5620 bytes
SHA-256: b4df2bb672e2db3c46694d74ab5193bfa270b2d37d5e85eaf599fc54927f0293
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 11132 bytes
SHA-256: 4ac856b10b931e30121d79b495c9be2d7150aefbffe227453da8258902b0fe34

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