Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c6b81bea0627aa…

MALICIOUS

PDF

73.4 KB Created: 2020-11-18 18:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6dcc39cdab15cd8c36fe5ee51f3be3af SHA-1: dbdcdb1ea3fdbde4ac32ada31887b4ccfe68c534 SHA-256: d4c6b81bea0627aa359241e9f7d8310b3c46f9d8e06021f250402506917e0db3
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://traffmen.ru/strik?utm_term=huebsch+washer+reviews'. This indicates the document is designed to lure users to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL 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://traffmen.ru/strik?utm_term=huebsch+washer+reviews In PDF document text
    • https://kukotefuses.weebly.com/uploads/1/3/1/6/131637352/615244.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nuziwozonugof.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/0d7d68207e4957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cf3de7-7e22-451e-90bf-c4e900649464/elite_pressure_cooker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/advanced_computer_architecture_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe1106b-c06d-4546-8f83-a0d2c48ce0ea/kennedy_in_massachusetts_race.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b644af8-a611-459e-aff1-69379da9fdd1/umbrella_academy_season_2_cast_imbd.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/pupirisunuxirapomimemi.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/razubugomuvanobejud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bdb012-4fa1-41e2-8f76-163c78821f12/eyeglasses_lens_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ead95f-34a5-452f-beaf-185cbf43bfdb/66626671991.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/9414288179.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wanugodopunusekiven.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/brocade_ds-_300b_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/blame_it_on_the_boogie_chords.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 5108 bytes
SHA-256: 9792e2d0e9e18a1f6cbcf3d00735bb0a1422bfde2e01ce37041512607a3fbbd2
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 11392 bytes
SHA-256: 725ab31cd6f26ab5b215d0a8ae2acadf393a3256d97943096f98c0f5b7bbce21

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