Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f39b29944df666…

MALICIOUS

PDF

68.6 KB Created: 2020-12-24 04:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 26ac37884ff556bfd23383e5dc288609 SHA-1: dbd28f44d2551d7804f661ed8f4973147f31bc25 SHA-256: 32f39b29944df6662be8779da9303d89ea71b5127086cb46d817322f67cbe861
252 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded links, many pointing to disposable hosting services, and one link specifically to a known malicious redirector. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt. The file likely serves as a lure to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?utm_term=instagram+app+install In PDF document text
    • https://dativabeduzepid.weebly.com/uploads/1/3/4/5/134587085/kureveme.pdfIn PDF document text
    • https://nobozufale.weebly.com/uploads/1/3/4/3/134322784/tinape.pdfIn PDF document text
    • https://muxekedov.weebly.com/uploads/1/3/4/7/134706321/somefudamutegoxa.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/371f5db99b07.pdfIn PDF document text
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/wizavukofotova-badedox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f9f28e9e91bd.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/74f421711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fcceddce0192.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/31b8dce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fd072378d79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f8a6a53cf2f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc8a43ac1598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 7244 bytes
SHA-256: f94a778176b253df136932bf285db87309371b772bdc22afe9ddd3e17a35b66c
font_01_sfnt_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 5076 bytes
SHA-256: 372c663baf40b80cbd49d1b5a7ee8782cd661160003ec9c61972ef74849e5dd6
font_02_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 10044 bytes
SHA-256: 1460bcf2298472a62b4c2d305c33e9f60238365e87e4e855a906adc6dc6b6766

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