Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4c556bcf0905a7…

MALICIOUS

PDF

77.8 KB Created: 2021-04-04 22:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aee6108d75eeec373d861ea8be3b2549 SHA-1: 230b3533d8c69763057fd5ccb43c16eb4a952004 SHA-256: ed4c556bcf0905a76c56acf283ebd3bde8472a50ee981262a6a37e435837f00a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://golowaki.ru/strik?utm_term=is+e+trade+worth+it PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fea027c8206c.pdfIn PDF document text
    • https://siduwibe.weebly.com/uploads/1/3/4/7/134775996/biwavugil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5fe2d9fecdd38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_600f7ffc08b12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_60325b98c3aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ff7ddef0344b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5ff6c40dd8e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_601b978312bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_603eae53131d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_605fa51464dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_600af3d37e378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fca9a56141a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_5fe755aad6e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd60edf75483.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/52f49b578ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_6037bfd8ad0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fd26f2a818b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://befojarariwowab.epizy.com/imperialismo_na_frica.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/rancilio_silvia_v6_espresso_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/tanimubepamafix.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/william_blake_poet_artist.pdfIn PDF document text
    • http://lobosubutuke.epizy.com/51332634078.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 4912 bytes
SHA-256: 715ea5f4510ebf952d5458aa70648b5ca26192435bbee8addfc53cb08b2f104a
font_01_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 11264 bytes
SHA-256: 0c83fceb6d9e67fe834f1434a4b7543828b95afdd8a88d463121a1d8933c03b1

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