Malicious PDF — malware analysis report

Static analysis result for SHA-256 87560ccc46d44153…

MALICIOUS

PDF

81.0 KB Created: 2021-05-08 23:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0691ade2d8b6cbecba952369e2425539 SHA-1: 5d545a6e1797a55b59555ac23dcc5194d060cabe SHA-256: 87560ccc46d44153175990fee725115e31d3f3ca7284c4c915ed746c53a001c0
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link to 'https://yafferge.ru/strik?utm_term=is+the+midnight+sun+a+true+story'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=is+the+midnight+sun+a+true+story In PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/kovorirejaw_tenufudab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_603955d61cff6.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/mojepenifi.pdfIn PDF document text
    • http://zawukinaloluku.sportsontheweb.net/92260528496.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/cuisinart_toaster_oven_tray_replacement_tob-40.pdfIn PDF document text
    • http://joxorapux.22web.org/addition_and_subtraction_of_radicals_worksheet_doc.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/hp_deskjet_plus_4120_not_connecting_to_wifi.pdfIn PDF document text
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/zorafir.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/extrinsic_pathway_of_apoptosis.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/676551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_600fb44b311a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupalim.atwebpages.com/puraxowurego.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/15797719164.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/56166890314.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/zombie_catcher_mod_apk_new_version.pdfIn PDF document text
    • http://pekowob.onlinewebshop.net/2d_discrete_wavelet_transform.pdfIn PDF document text
    • http://bamenawasez.epizy.com/72203729237.pdfIn PDF document text
    • http://jefokid.rf.gd/build_my_life_chords_g.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/633230201.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/british_passport_application_form_download.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_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 5248 bytes
SHA-256: af4406944de5b8424992469e8663382e274629734c8dadb11b8148ffffedc6b1
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 11592 bytes
SHA-256: 7c541491b01c3081045989002c62aed40d73cc09b3ce56793e914be839198f4d

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