Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc792be6f1b22842…

MALICIOUS

PDF

75.3 KB Created: 2021-03-02 03:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3ab42d3997be4ea0a88ad785b42e8505 SHA-1: 8c2ecd75f7c5d98eb01b6edc0101913d8d8ecce2 SHA-256: cc792be6f1b22842dd9e440de6f9ab999813728e9976a030f9abab8ba41a090b
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver 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
  • 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://crophysi.ru/123?utm_term=does+walmart+grocery+delivery+accept+ebt+cards In PDF document text
    • http://fasad-dom.site/anker_bluetooth_keyboard_wont_connectf5agp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_601f11192b427.pdfIn PDF document text
    • http://uchebnoe.website/rilexukogutilufepumen63e2m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_6034fb2c5b404.pdfIn PDF document text
    • https://mugejonisisekof.weebly.com/uploads/1/3/1/4/131437633/7527576.pdfIn PDF document text
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/6700168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_601e6aaf23758.pdfIn PDF document text
    • https://pobifixakije.weebly.com/uploads/1/3/4/4/134445477/guxorevinobunova.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/5169431.pdfIn PDF document text
    • https://wigalibole.weebly.com/uploads/1/3/0/9/130968912/firovizexuge_tepukut_gosanasik_gitegoda.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/35f67806763.pdfIn PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/cdb1fcec162cd60.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/jipowumat/ready_to_die_biggie_smalls_album.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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5784 bytes
SHA-256: ba42cca89c4a9d40f577d23b15aa9d930374ec6afbd89b81d73a00d70d4a6b4d
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 10148 bytes
SHA-256: bced71da350121e8572da8dcaa4b4a34f43c7dc4ee39c957ce21a97e1362f47b

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