Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf7aca9af1a4efa…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 16:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7362208d01381cba7ffd0650c130ef8d SHA-1: 828b975925afe9731364022e0ec64ccdbaa13549 SHA-256: faf7aca9af1a4efa9432c6d9a2785e2fb5925f1f0b924d40259c75dbf430218a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs and the document's apparent purpose of luring users to download software are consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=assassin%2527s+creed+apk+download+free
    • http://fajiriduxir.medianewsonline.com/prefixes_and_suffixes_worksheets_5th_grade.pdf
    • https://pitejuxupukure.weebly.com/uploads/1/3/4/5/134500798/7011684.pdf
    • https://cdn-cms.f-static.net/uploads/4406482/normal_606916fedfaeb.pdf
    • http://lopixerirerenex.mywebcommunity.org/structure_and_functions_of_proteins.pdf
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/virowuto.pdf
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/8820763.pdf
    • http://kakafeg.scienceontheweb.net/monitorear_red_wifi_windows_10.pdf
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/2871f8cf.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_600b3e4b44aee.pdf
    • http://jukekelexoseda.22web.org/have_yourself_a_merry_little_christmas_original_song_lyrics.pdf
    • https://static.s123-cdn-static.com/uploads/4376621/normal_5feedff397752.pdf
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/rikexotodiwake.pdf
    • https://zabamatuli.weebly.com/uploads/1/3/4/3/134348910/ludivi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gikikojumikobep.epizy.com/84993361397.pdf
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_91af06e62cbf4ada83a81a242a9a97df.pdf?index=true
    • http://togipumenotu.epizy.com/zevabinugurugoz.pdf
    • http://kuzemepusiloj.onlinewebshop.net/silent_letters_in_english_exercises.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_99d5cf87efb24cc582767f3bb5980267.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_01b2d93976f2488d82fed0fc9217a28e.pdf?index=true
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_843a1df206c149389bcad0893ff0f1c4.pdf?index=true
    • http://jonesojawu.myartsonline.com/wenepelenosikiralibesek.pdf
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_52ee0b6cb78d406da91a050c9f4bfab2.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbc.bin
b5cff77091ea54d907c61ded3c5cad8f9992dcc51db25618953672ec3fc51bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5328 bytes
font_01_sfnt_off0000fe09.bin
6c46949851b1493755541d7bbba2c9e9d4859729159ea76ccf757eb87570b35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 11160 bytes

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