Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8bc7782c8f06ea…

MALICIOUS

PDF

62.5 KB Created: 2020-11-27 14:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c6e59129956470fc4de501f6e969a4a8 SHA-1: 052d03b1b65d22517cff23381e992eae16d7fbf2 SHA-256: 1c8bc7782c8f06ea345c0ae9a04862f4e3a1b5d220f2367376773c62f9e11c33
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to disposable hosting services and a known malicious redirector. This suggests a link farm or SEO poisoning tactic, potentially leading to phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=experience+psychology+3rd+edition+laura+king+pdf In PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/gebaxidodi-pofubigu-balizoboditi-dutiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5fb5e14c1cc87.pdfIn PDF document text
    • https://jawokisejul.weebly.com/uploads/1/3/4/6/134601468/jexakerede_sonim_repivovefegiwen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5fa95f6c1f125.pdfIn PDF document text
    • https://piloseweme.weebly.com/uploads/1/3/4/4/134491853/2934674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_5fa8dce9dc71e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fafe3fac5ca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5f9c60a2061a0.pdfIn PDF document text
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/cf4b80b1cf1d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5f9c795143669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5f8de7c22011b.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/numeriredujape.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/sutudotuvunekor.pdfIn PDF document text
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/0fc7b50.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/a38e7907-9f18-488a-ad93-981f02334e43/rojowinonozotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21b808e-1d3d-4636-ae8a-b03144b4d7b8/16197276951.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_off0000b70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70C 5772 bytes
SHA-256: 67a849c8bce22588ca99ae1e5134aff1e7317cbb7bc160139806079a995fd6bb
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 9984 bytes
SHA-256: e09e562884a37aa6dfa422a6be052c5bf5502d2601891f543d271d704958603a

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