Malicious PDF — malware analysis report

Static analysis result for SHA-256 950392b1ab90da23…

MALICIOUS

PDF

79.7 KB Created: 2020-12-30 01:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: af33bca14f1cfd17db26743f8952738b SHA-1: c1adb9bbac54c8c368f29c3e88e7b00fc7e9a0f2 SHA-256: 950392b1ab90da237b53cf6340af042057af7eade5179ab165c97f7a64284539
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=arnold+schwarzenegger+soundboard+good+morning PDF link annotation
    • https://gexuxufe.weebly.com/uploads/1/3/1/4/131406387/2a5d3262e5d69f.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/2559224.pdfIn PDF document text
    • https://dutigopomifit.weebly.com/uploads/1/3/4/6/134611267/378f65288.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/324248c1e1a.pdfIn PDF document text
    • https://pajodiwid.weebly.com/uploads/1/3/0/9/130968992/5606559.pdfIn PDF document text
    • https://cdn.sqhk.co/juzogimuju/hjgOTh5/vendiste_punto_com.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/zojudusaw.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/2506017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a17a80-3f4a-4dd1-9dba-e67b39b5d687/mekepofiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/72924964910.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/10301671004.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_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 5624 bytes
SHA-256: 6721b8af554aa45df3e26552980795fec0b3ad4fcc5cedb5b78370809673b175
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 10836 bytes
SHA-256: e0b06176ae85370a5c69e472ebce33a3e3b1498ab8afb43ef249ecf7706fb945