Malicious PDF — malware analysis report

Static analysis result for SHA-256 a466aaeef3505718…

MALICIOUS

PDF

75.8 KB Created: 2021-03-10 12:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45f79908ec42d1a9a8ffa23252f31331 SHA-1: 7693b3b4a6cd588e66e1e55f5fbfc6ce6ab092ef SHA-256: a466aaeef3505718eb463d6e178568b6f0b4688b2e127f2e9d0e645a13e5ec7f
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or a mechanism to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate a potential for malicious redirection or content delivery, possibly leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=banjara+dj+songs+free++naa+songs
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/lasekunojiraku.pdf
    • https://cdn.sqhk.co/loganidob/deencjo/sosaf.pdf
    • https://ginijamuda.weebly.com/uploads/1/3/1/4/131409148/8250889.pdf
    • http://pigalimiru.medianewsonline.com/pezemupusura.pdf
    • https://cdn.sqhk.co/pajerelo/Shhgc8h/denisimiwijofiz.pdf
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/c5f7167e.pdf
    • http://sijubuwejipamun.mywebcommunity.org/monthly_calendar_2015.pdf
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/pukudumil-febepijajukubu-velowod-pobugakatadajin.pdf
    • https://cdn.sqhk.co/vakolitakap/dNhhjj5/rudiwixuvado.pdf
    • https://cdn.sqhk.co/buzomesil/iifmjhY/nepazuzupukujezijitam.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/jasalar.pdf
    • http://vizexibidoxi.getenjoyment.net/77081417350.pdf
    • http://sevagawos.getenjoyment.net/manual_practico_de_aceites_esenciales.pdf
    • https://cdn.sqhk.co/pugirunosamo/ejaKihh/battle_angel_alita_ova_3.pdf
    • https://cdn.sqhk.co/gusiloxi/jf1hehd/gunadenirefitavisa.pdf
    • https://rujumimipadud.weebly.com/uploads/1/3/0/8/130874091/803160491fc86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_faefd20f9ea246bb9a6e9a8021d1cbb8.pdf?index=true
    • https://5e86d2bf-4ad8-496a-9e8d-bde47e9cd161.filesusr.com/ugd/b56239_e748b8380ed64e5b97c60eed4b2a95eb.pdf?index=true
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_3fd8aa2bc62444df96cd9b1a08eb311e.pdf?index=true
    • http://rogomore.myartsonline.com/what_are_the_steps_involved_in_preparing_a_lesson_plan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbf.bin
a7e436f4d4772aefb4d3ecdb0915b0098fe8d4c87f222f8b8b1b43fa0466171e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 4828 bytes
font_01_sfnt_off0000f031.bin
3c91deabdd3dce94e833c47c354fb86664d3d37c57f1e9777d6c941b7efff82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10704 bytes
font_02_sfnt_off0001139e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 4324 bytes

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