Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfbfb4556e63528…

MALICIOUS

PDF

84.3 KB Created: 2021-02-27 18:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a6d87e9839d635070f1a7fce5e0a9267 SHA-1: f4fdc60d3e91c529034ed5024b64e82438ef8162 SHA-256: ddfbfb4556e63528172667434a98469faeb074d5c6fbe11983f211f3cb991d11
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to a sewing machine repair manual, aligning with a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://druttle.ru/strik?utm_term=brother+cs6000i+sewing+machine+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464873/normal_601554f55799a.pdfIn PDF document text
    • http://jenenirefu.iblogger.org/new_bollywood_movies_in_mkv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_600d65747e798.pdfIn PDF document text
    • http://jefigesawek.iblogger.org/english_course_classes_near_me.pdfIn PDF document text
    • http://jokebixa.22web.org/command_prompt_complete_reference.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60210e1b58a55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xalasawu/kunovefekakulipavuta.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/android_videos_from_sites.pdfIn PDF document text
    • http://dikewovob.epizy.com/zimuduv.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/distance_and_midpoint_travel_worksheet_answers.pdfIn PDF document text
    • http://fonugaxow.epizy.com/37337716862.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/coleman_powermate_pro_gen_5000_owners_manual.pdfIn PDF document text
    • http://fadojogepu.epizy.com/best_football_player_workout_program.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_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 5664 bytes
SHA-256: 41d5f4ae9e360a9742dcaeae7c37a90d0bfc24b17423718870c2c57579bde05d
font_01_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 10880 bytes
SHA-256: dd86a9f28c98dd77f95743700fb5fec1b30dd97ff79f689f2e3886199cf81fc3
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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