Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aee38102005bf87…

MALICIOUS

PDF

76.1 KB Created: 2021-02-25 11:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cd4d5fbfd4611eb88ed8adb5aa04c62b SHA-1: 23207b664493fa9fa252b4c8635baf0ef7c678cc SHA-256: 3aee38102005bf87ea3a2d20b15cd2cb66969e670471f12a240fcda28787fc35
222 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious domains and are flagged as redirectors or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. The presence of a 'download' button lure further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=hp+deskjet+ink+advantage+2545+driver+windows+7 In PDF document text
    • http://lixodamevurobar.mygamesonline.org/roku_streaming_stick_plus_remote_wont_pair.pdfIn PDF document text
    • https://xuvelusikifaza.weebly.com/uploads/1/3/1/4/131406656/4191048.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/gyIrjcQ/revenge_of_sultans_mod_apk_revdl.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/second_grade_spelling_worksheets.pdfIn PDF document text
    • http://limaxinsto.xyz/61202973988pmmjy.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/microsoft_word_2007_keyboard_shortcuts_not_working.pdfIn PDF document text
    • https://kokezixunilo.weebly.com/uploads/1/3/4/0/134096179/pitupo.pdfIn PDF document text
    • https://dilaxizinis.weebly.com/uploads/1/3/5/9/135973905/5327782.pdfIn PDF document text
    • http://gloslides.com/25064625197r5smp.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/tozaduliwubega/bewesevugazozef.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/did_you_hear_about_math_worksheet_answer_key_page_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/rudokepufinaxukesagitaz.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/mindless_eating_book_review.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/rhyming_words_dictionary_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/vomogemiz.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_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5560 bytes
SHA-256: f97cfca0d435ddd4b50751b7358aebea1fd854396c0b62064842768ed388b04c
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10136 bytes
SHA-256: 04efe0962ebab51629883e150307aa7f8017bde0cf3a919547ffe8ced3154ba8
font_02_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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