Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd53c7d75f60c02…

MALICIOUS

PDF

71.8 KB Created: 2021-02-25 15:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f024025c65be3a16d8f4048d0523f4c9 SHA-1: 6ed491110328879a20beff2afc7bd2e8d8cf5f32 SHA-256: 7cd53c7d75f60c02d0397d2a256df3fa92cf4af39f7f80939515e7ac1cc604f6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of an SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=multiplying+and+dividing+complex+numbers+worksheet+answers PDF link annotation
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/8135641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490724/normal_6005d125a67cb.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/nexido_sataxebimafipa.pdfIn PDF document text
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/3d4cb682b8a.pdfIn PDF document text
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/xasilifenoranovuf.pdfIn PDF document text
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/da5ac44fafe2.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/vixexafifaxi-bipebuge-jawoz-tavodiwenaxo.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/8641474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://silapopo.epizy.com/nidak.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/what_was_the_purpose_of_the_jacobin_club__1_point.pdfIn PDF document text
    • http://dowufinaj.rf.gd/what_happens_at_the_end_of_the_magicians_nephew.pdfIn PDF document text
    • http://meluxowuxepos.rf.gd/92774822965.pdfIn PDF document text
    • http://borovob.epizy.com/simple_present_negative_form_structure.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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 6020 bytes
SHA-256: 4adb8b6122a92c434cbc00b9c45e425e6b2054af9afc0d42d946b3d0eccb76b6
font_01_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 10992 bytes
SHA-256: 0efd00f24d50fe333f89297a4c721ff84566c7aefd999fdcc896a488bc93fad9

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