Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c05c65424a19b46…

MALICIOUS

PDF

139.6 KB Created: 2020-11-19 09:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 89a1ca8cd4d8e650995094d929df2872 SHA-1: 93eab866799a3461ef35142a1911ed12cce4f3d8 SHA-256: 4c05c65424a19b46a35baed6898afda149387d208a0f6192875b5f543efb53d9
214 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 embeds a large number of external links characteristic of an SEO link farm and 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 0.9987

Heuristics 5

  • 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.
  • 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://traffmen.ru/123?utm_term=csi+algebra+2+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5f9c6a5f8702f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5f9e3124f12b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5f9dab652d3ca.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/2540490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_5fab99f2471fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8885922b3da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f8f05c498518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_5fa2973c14a09.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/057e4a0e-aae7-4ab6-8823-d1505cb7b92c/6728199538.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/how_powerful_is_the_anti_spiral.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/osrs_herb_boost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d80670f-1db9-4484-ae45-aff0e69f11eb/91473306669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d638e226-5b10-4e91-b67a-9053eb9cb85a/44878568804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c3588a-50e7-4531-bb79-7307ffd5d52a/chat_mu_online.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAB6 6760 bytes
SHA-256: 0f30c38901f317d29c39cbfd510d99c2edbcb1c1630163602b9b4c195f6dae91
font_01_sfnt_off0001d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D14F 5288 bytes
SHA-256: 954199519a0768518247e18c8460617b2b24bb4368f9462ddb204e3f9445cfb4
font_02_sfnt_off0001e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E375 11872 bytes
SHA-256: 304f315fc042b95af4d1ca59ec9dc3ff75cd21c95284d6a064d30783b2fbd856
font_03_sfnt_off00020c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C05 16028 bytes
SHA-256: 13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b

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