Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d1ebb8491930a1…

MALICIOUS

PDF

73.2 KB Created: 2021-04-05 23:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31fff811bfdb8ea9f16f0c75c55e98a7 SHA-1: e260317c0eb8446d194f4ea791490ba873c2a81a SHA-256: 22d1ebb8491930a1b6bb96e473a190407db065a755cbd2ccc056a3a13d53771c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to multiple PDF files. The primary malicious URL, https://xajibur.ru/wix?keyword=worksheet+circuits+ohm%2527s+law+and+power, is embedded within the document's content, suggesting a lure to a malicious website. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

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-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://xajibur.ru/wix?keyword=worksheet+circuits+ohm%2527s+law+and+power
    • http://zadunidukutar.iblogger.org/juwebaxa.pdf
    • http://mejumeroxara.mywebcommunity.org/bearing_capacity_of_soil_test.pdf
    • http://gajonedorebuko.mywebcommunity.org/ninebobut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xidapevow.epizy.com/doraemon_story_of_seasons_guide.pdf
    • https://s3.amazonaws.com/juzowilipi/37826826428.pdf
    • https://s3.amazonaws.com/davolazupivowi/48036892284.pdf
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_de8f05a7e7a049dbb86298fcf202c0e4.pdf?index=true
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_bcd6ec418ba3435d909e112520385e57.pdf?index=true
    • http://dakelajipupak.epizy.com/45306266425.pdf
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_556f166182014a2ab3577b0b81401dc8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c78b71ad-22b2-4f33-9e26-e6f47691dad5/what_alice_forgot_movie_imdb.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/75473017948.pdf
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_dadfa5497cad471f8ec188042c14b996.pdf?index=true
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_ef8e9df441b04bc0ae9054ee128c6c90.pdf?index=true
    • https://s3.amazonaws.com/pasawexawinogad/texto_informativo_breve_sobre_la_contaminacion.pdf
    • https://s3.amazonaws.com/divikufifir/viwus.pdf
    • https://uploads.strikinglycdn.com/files/077bfba7-fc4d-406e-92ec-feecae622702/91545112648.pdf
    • https://uploads.strikinglycdn.com/files/b1e35da2-6603-4ba6-883e-54745c09abc8/pomixawitudunuked.pdf
    • http://xinifaduzinuvu.onlinewebshop.net/masterbuilt_sportsman_elite_gas_smoker_parts.pdf
    • http://meloxosiza.epizy.com/brownian_motion_and_diffusion.pdf
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_352c9cf2c3e840069b4faee94d495137.pdf?index=true
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_d2e3dcd9ec3045dc827705e5aa6c56d2.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_off0000dca0.bin
2be96c316bf0ee817bbf03bc7bd140e5f7d652fb71580659efbfa085a5f4a6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 5516 bytes
font_01_sfnt_off0000ef59.bin
8e3845af8d14a8e846899d3d22bc58b42bd0d76bbee334af3a58e34087628a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 11816 bytes

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