Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a449a7122fd8938…

MALICIOUS

PDF

79.6 KB Created: 2021-03-08 21:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9ad957492297e98ac14cda9d4ddde17 SHA-1: d4b4abfe0f3694bfadb402f5166cf9a08f4efce3 SHA-256: 7a449a7122fd8938bec7a961ad3043aab80f2ad2d52eacdda7c56eb8f8e740e3
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/123?utm_term=2.+5+mm+to+gauge+sheet+metal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5ff52b09c3024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_60264551d9d31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5fe42dcf789f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5fe61cb29017d.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/jersey_mikes_nutrition_data_tuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5fe221b203cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_600c3efdc329b.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/iso_31000_risk_management_process.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_6006e71d2c766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_6b0735ede1244679a44f44ef468fc64b.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/little_red_riding_hood_movie_adaptations.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_1eb490c184044ad2930ed28aa80307c0.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_1c7c3f8b142140b7af34b106b70f21bb.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_665dc4c4fd184ea59ec313c301e958d7.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_315ac01bf71d4562bef92e3070b663b5.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_aa355ee3f7fa4a3db2e66882a0ca8e82.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_d0893f9349f7447f8c88388e22e64815.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_a36075dd86c34feb8ec2faf18de30bde.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_da8d9a3429d84c1d8ea0857596a5d516.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_e1c4dd4c77fe41f6b25fdf2392c31d4f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 5196 bytes
SHA-256: 85f9e66a9f72a677848d861566acdc3adc24a7e33aa7546d66afa8cf3cc11573
font_01_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 10128 bytes
SHA-256: 31a2f752b8fb2e46f0eda2b0a599bc2bcbe842e278c05ed28d1c113e6a4ab393

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