Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3fc36040fd5622…

MALICIOUS

PDF

69.6 KB Created: 2020-11-24 12:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bce8cc9cef905a21bb615eaa538cd5e2 SHA-1: 60788f06e2b37b6352d4087cc4e017faaa6de1ad SHA-256: 4e3fc36040fd5622875c9d039e199bca69fa2629613816d0effb6362b34d7efa
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and part of a link farm. The primary malicious URL, 'https://ggtraff.ru/strik?utm_term=principios+basicos+de+la+comunicacion+pdf', is a clear indicator of a phishing or spam campaign designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=principios+basicos+de+la+comunicacion+pdf In PDF document text
    • https://nonokutofukidob.weebly.com/uploads/1/3/4/8/134872148/9289621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5fa99dee13328.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/1261071.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/pexazudafejas.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/julaxel/deferred_tax_provision_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/recycle_number_4.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/25283970176.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/blood_drops_csi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8596fae-802c-48bf-90c2-b5903f0c33f7/42102379801.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/aha_take_on_me_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/antioxidants_and_cancer.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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 5444 bytes
SHA-256: 729624ca546cc4bc2ce3a9c06f30c8ab8dd6fdbe213d37467d18396f4ccca6e0
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 10712 bytes
SHA-256: 11e697689b61e93bab951bb89cf260a8d22f5fd2c09b25fa6b0ba4ca515da2a4

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