Malicious PDF — malware analysis report

Static analysis result for SHA-256 752e4a78f27b64da…

MALICIOUS

PDF

113.9 KB Created: 2020-11-16 23:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 65cd74ef62eeb5c823431af19397820b SHA-1: e83b7505650eba090863ab32304dcdb255240ab7 SHA-256: 752e4a78f27b64da73cb59305deeff225dc447f8f68c0326317f701e00121a60
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming, including links to known malicious infrastructure. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded URLs suggest an attempt to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/123?utm_term=fim+fam+assessment+pdf In PDF document text
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/musilonosor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f8838b63297d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f906b1c62191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8cb49daeb57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f87f863d63cf.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://uploads.strikinglycdn.com/files/783c2cfe-37a3-4312-b38e-5652d2b295bc/decimal_fraction_to_binary_fraction_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b142c120-993b-4441-9e7c-4c0358c19d06/tafujedopoxopezix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950524c4-afe5-4fe7-a24c-ec8b7bbe2770/39322385387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c67dc0-c38e-4d7f-a9e5-0f484a66310d/sadlier_connect_religion_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e74c46-0251-4a4f-8be8-01dad6590ec4/35913065706.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/university_of_southern_california_information_technology_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ab9080-16e8-4c15-a7d0-c2db765c17fd/81965111003.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAF 4692 bytes
SHA-256: e603a37e53045e73b9daa75a5958bb4595c8d16bffcc4fd32244749761d65e19
font_01_sfnt_off00016e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E7D 11888 bytes
SHA-256: 1e865a517730a2a88f5433550613d09be48ae9955bb366be6ff33a5bf5736018
font_02_sfnt_off00019703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19703 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off0001ac33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC33 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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