Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5b8a9fcda97b02…

MALICIOUS

PDF

77.9 KB Created: 2021-03-06 09:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c135264645066f89e000ab622cc81926 SHA-1: 25bf05857a984f2c5e81f0084cda3ab41ba3f950 SHA-256: 0c5b8a9fcda97b02a3062612a1b391d47ccc918a7e22cb74b5ecee07bc80904e
154 Risk Score

Malware Insights

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

The PDF file contains a link disguised as a helpful guide for fixing a Maytag dryer. This link, however, redirects to a known malicious domain, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URL and the nature of the lure are sufficient indicators.

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=how+to+fix+maytag+dryer+not+spinning In PDF document text
    • http://wotukujis.sportsontheweb.net/rixifosebe.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/makojezavifoli.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/NgdQXge/ludo_online_multiplayer_hack.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/salary_of_medical_officer_3.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/33288963769.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/b2mhejc/zidewoxokekovilepodita.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/les_mis_abridged_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/gjhJWhh/68818765107.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/tasufagijaremo/arbitrage_movie_300mb.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/praying_from_the_third_dimension.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_47a1cc427e0e4164836c9358b4b1b5d3.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_8819ff2ac86142f39a20d7aac9cb9a0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/alabama_college_football_injury_report.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_0711b0c1c6784994adbeee822576c20e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizufapu/good_science_fiction_books_for_adults.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_9ce0d853588c4eef8385297cbb8290d4.pdf?index=trueIn PDF document text
    • http://wutesejib.onlinewebshop.net/towijurifowut.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/esp8266_wifi_nodemcu_datasheet.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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 5552 bytes
SHA-256: 9b12aa73352f79296db5b347423228c0af8e90d2264d7f05d251ec35fe31e642
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 10524 bytes
SHA-256: dd38976319d30b8ab673a5fa76e498f835982517775bd47f3cb11cf00a134191

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