Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab707ea143256a0…

MALICIOUS

PDF

60.0 KB Created: 2020-11-29 09:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6a8793393666203c86ba7a5337f20832 SHA-1: e04020208abc096015ec8e1fb5c3c712ffd87cff SHA-256: 0ab707ea143256a0d42848a3ee2af5a08ee93491b63f1b3e83717125da4f85fb
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain text related to a 'study bible pdf' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/wb?keyword=nasb%20study%20bible%20pdf In PDF document text
    • https://lolipakefupixo.weebly.com/uploads/1/3/4/6/134614949/2232470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f8773516f9e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8b352f8257e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f8cc23ca3f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_5faba1241e82d.pdfIn PDF document text
    • https://fuwurugosudopo.weebly.com/uploads/1/3/4/3/134326966/b83b01d84c05a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_5fa303db20942.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/a6f4012e-6156-46f1-b17b-25721840892c/bali_honeycomb_blinds_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ae3143-0bf1-4647-aec3-f7b7c9a81229/88657739827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7201f7-f218-4954-b9c9-8ec16c862665/canteen_management_system_project_in_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6d0110-9f63-4b62-a4c8-7f28231c10e0/one_sample_t-test_between_percents.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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 5152 bytes
SHA-256: cd5c39b2515f3960b12970b0be463f2b7f3c5ae4399b1bc297ea479a3f9ad3ee
font_01_sfnt_off0000c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC159 10020 bytes
SHA-256: 74f6ae33f487fd5a5edc46f45c167014637cb1cda41295e8d4b3150835034eb1

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