Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5a744540bb1c11…

MALICIOUS

PDF

96.2 KB Created: 2020-11-11 05:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6869de30f9f03a2d42b2192d6cdc9161 SHA-1: 0b40d5f78935e3c5db0f38d690208ca0513a9f09 SHA-256: 8e5a744540bb1c11f770d1ede6827e3683a293a73b9d7dd70208dec104d17723
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9994

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=huang+lei+drama In PDF document text
    • https://xinufagepowe.weebly.com/uploads/1/3/4/4/134437511/sikomojom.pdfIn PDF document text
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/d496b69d7dc8.pdfIn PDF document text
    • https://pavejomesof.weebly.com/uploads/1/3/4/3/134310872/6616257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f994fe321b51.pdfIn PDF document text
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/xowimadikitotufebo.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/biresole_kifovidijoxez_lonisogewofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fa3905955864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daniwodug/drag_racing_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e1afd2-1f6f-4a3b-abf8-f98e56a52494/linksys_wusb54gc_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1674dc-3b28-441d-9230-4bb7c96c6308/55488667507.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 35928 bytes
SHA-256: 762d226d96885108da30adce446886128fc3cfb8091c1f442bd1b921adff1da4
font_01_sfnt_off00013ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD0 4928 bytes
SHA-256: 31a433a2a3efb6a24a54548aa7811ef7c4acb904e328fa09f8c89b661116edd2
font_02_sfnt_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 12408 bytes
SHA-256: 9a11823ceafc6cad6c6fa5dd338ed7b15df7010e9acefe201765a35fc599edca

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