Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b130daf4c3a4c9…

MALICIOUS

PDF

67.6 KB Created: 2020-11-13 17:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 419e2d6c471b2e9500e0123fe25172a5 SHA-1: 5ddbf2e3f3e269c8f928c0b90fba40cab45228ef SHA-256: f5b130daf4c3a4c9cf07f8562df0805f9589767f897b34a23782fa440331ec31
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a redirector to malicious infrastructure. The ClamAV detection and ML classifier also indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=parts+of+microscope+and+functions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_5fa58901247b6.pdfIn PDF document text
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/sopakefu_fivutexem_xifulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5f9bed988fa77.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/kifuxanewupifutoledi.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/6223462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fa0040de0a65.pdfIn PDF document text
    • http://www.microscope-microscope.org/basic/microscope-parts.htmIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupuso/how_to_get_rid_of_a_curse_on_sims_4.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/7277095652.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/veronica_roth_carve_the_mark.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/zujanifabupurixulukipixu.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/lagovovuxozokefejije.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_off0000cd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 5272 bytes
SHA-256: 4815af030305d3039fe7b4269b42c592bc8fde1103df50372e18c68739cae35e
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10308 bytes
SHA-256: addec7374850e14395c41c489549c8753fcfaf622ad45c43e0fb2fd71de0f42e

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