Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37b66a813aa3e82…

MALICIOUS

PDF

78.5 KB Created: 2021-03-21 06:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34e111ae58e85f1b425adc8e7045a8af SHA-1: 2f9a1d99d9344148c56466051c8cdd59aea48510 SHA-256: a37b66a813aa3e820efb3f4e62016b45e5e7f4590bb45fbdf051a3f0ca9a0c60
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=directv+aspen+channel+guide'. This indicates the document is designed to lure users to a potentially malicious website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests it's part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=directv+aspen+channel+guide
    • http://fartook.online/lajubivoxulajutowarellk93a.pdf
    • https://cdn.sqhk.co/guzikiku/gdGAjfT/3d_black_wall_tiles.pdf
    • http://nemagufi.mywebcommunity.org/89437402979.pdf
    • http://pixell.store/machine_learning_algorithms_for_healthcare_data_analyticsstner.pdf
    • http://cleanup-sale.site/1056764862ox3a.pdf
    • http://kositexujir.sportsontheweb.net/past_perfect_continuous_tense_exercises_worksheet.pdf
    • https://cdn.sqhk.co/zezaxemepe/hijhYgj/accentuate_the_negative_investigation_1._1_answers.pdf
    • http://grandov.pro/lulazexetovejavofokipulorn6xv3.pdf
    • https://cdn.sqhk.co/wobuwozavenu/dEhbih9/nda_1_exam_2020_answer_key.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3024bbe2-fe40-475e-8384-091a48550f19/51953116813.pdf
    • https://uploads.strikinglycdn.com/files/4a958522-5487-41d8-be7d-92bbe2baadb2/74492358068.pdf
    • http://vozekalazasof.rf.gd/formule_chimique_du_sulfite_de_potassium.pdf
    • https://uploads.strikinglycdn.com/files/4d0f31ab-3163-475f-b00a-acd92d513a5f/xigem.pdf
    • http://tipokeviti.atwebpages.com/xekof.pdf
    • http://zufelagek.rf.gd/58392152436.pdf
    • https://uploads.strikinglycdn.com/files/09cfdf0f-2093-4964-9ff4-ad17e07acf43/12180986248.pdf
    • http://xalesikejuxo.epizy.com/34956295122.pdf
    • https://uploads.strikinglycdn.com/files/f0593dbb-3ebd-4180-83f5-8e980e28f97a/33094345205.pdf
    • https://uploads.strikinglycdn.com/files/0593e0a1-c58c-44af-9925-40b5853b42fc/93481170522.pdf
    • 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_off0000f21b.bin
9d66bb7ab578f4fb035dc6ceb1391b085d3964bb92d46c2768f8c19132cc3f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5396 bytes
font_01_sfnt_off0001047c.bin
d48e4c159ca7441d829615d637ca61abadc1b8cddb376d551c7bf3309064c1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 11816 bytes

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