Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e6f3211bb56f24…

MALICIOUS

PDF

67.1 KB Created: 2021-02-16 14:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54334d635c8d332a3f86217f43ebf2ee SHA-1: 8361b9ed51b55af4fb5d460d70d6bf0c7627df5b SHA-256: 83e6f3211bb56f24e27ccc773bbd23f47c82d8e59087cca73f5210855f5c72b8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous embedded links, many pointing to disposable hosting services, designed to create a link farm. The primary link directs to 'crophysi.ru', identified as malicious redirector infrastructure. The document's structure and extensive linking suggest an attempt to manipulate search engine results or distribute malicious content via these links, likely as part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/wb?keyword=how%20to%20program%20aqualink%20rs4 In PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/2063707.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/6af89b7995.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/vDwjbpa/wupesipope.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/vinasexir_tepufanewero_nixexado_gobap.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/08f16d1d9ec069.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/0bJieak/71003110741.pdfIn PDF document text
    • https://lefelovavuj.weebly.com/uploads/1/3/4/6/134644752/7307138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6013a1915c6af.pdfIn PDF document text
    • https://xofiwilo.weebly.com/uploads/1/3/1/4/131453946/234219.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/buwirediwuk_japupon_zovuwobifefi_zelolusiwow.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/fadobirak/simple_web_design_templates_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/jelet_2018_answer_key.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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 5468 bytes
SHA-256: bc6992ecdd3c55d7ddfab52706382d0ecf0a3c9bfe2fd06bae827e46e5e772ad
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 10468 bytes
SHA-256: 3338bc52977115c529d0e18cd0bd7987879643be34d5f5c6af8998174a491755

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