Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fbe3f44dfd93e8…

MALICIOUS

PDF

68.9 KB Created: 2020-11-11 04:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e37c6a66ea9a3724e4283f0d9f5af81f SHA-1: de171eb51bf93ab1c3465ffadf2f0fb494c54fbc SHA-256: 77fbe3f44dfd93e866e9a330ae3530687624e36bfe8fc77b2da013ce5f479521
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?keyword=clark+field+west+springfield+ma In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f95455db09a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5fab2b35c65e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f90618395311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f8d250eecdc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5fa4a96a22175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_5f8f3372b0b54.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/tezofuretejom/dnd_5e_grung_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/53437657932.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/plan_pergola_adosse_bois_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/purolator_oil_filter_application_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/army_information_assurance_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/87903872261.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/arihant_ncert_solutions_class_11_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff544d64-78f0-4db2-a1c5-b746ef60a0ae/pawivurigevixenebafux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2dda30-3961-4ca0-9c07-3586e013c086/britannica_encyclopedia_android_apk.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_off0000c205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC205 5220 bytes
SHA-256: b8bb34cbdf55b7a0902d83fa0022f845654932f6774337b84e0850e326f64565
font_01_sfnt_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 10812 bytes
SHA-256: 0d6e115050a1de05ae74f26b31ee734663fbdfcdc9c8237121894f28f1361c08
font_02_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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