Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5d72c8abc7904d…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 11:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b7b4b3bc279dccfdc25d4be16ec6c6e5 SHA-1: 562522e0da823bd78d76a3af90757ab70a727391 SHA-256: 7f5d72c8abc7904dfacef466eaff654e023b6e5b7b7b8f53c5e36902a2b7b517
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=chess+tactics+puzzles+online'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'chess tactics puzzles online'. No scripts were extracted, but the presence of malicious links is sufficient to classify this as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=chess+tactics+puzzles+online In PDF document text
    • https://cdn.sqhk.co/litigoruf/cgeggq0/tropical_forest_match_3_story.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/cOhaqhf/amtrak_auto_train_cost_for_car.pdfIn PDF document text
    • http://watutuwox.iblogger.org/armored_core_nexus_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60140f5e6afb6.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/xjh1Cid/idle_courier_tycoon_3d_business_manager_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/chbrHid/zefarawirobomapikejulusop.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/RBRkicR/wuzuvojare.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ohcgegh/battles_of_world_war_2_timeline_worksheet_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuboki/site_acceptance_test_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/26340161675.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/53483932371.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/sakhi_telugu_movie_naa_songs_free.pdfIn PDF document text
    • http://bamasagure.epizy.com/85640785352.pdfIn PDF document text
    • http://gavenivifi.rf.gd/61128528443.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/84456658391.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/shazam_for_pc_win_10.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 4880 bytes
SHA-256: c6a724efbc07be3b6d1b209b7405469f40edae5a601641f4ad0ac47f5269d019
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10364 bytes
SHA-256: 891859e17fbac77537d7b9eba8767919d53b902e8f678af529e9e7c1700864e1

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