Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b78285e797ab18…

MALICIOUS

PDF

68.9 KB Created: 2020-11-09 20:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 506c7b32eb48082982785d11cfe87ee3 SHA-1: dd950c1f6ac7cdd89a6ae7379c2281343258b74c SHA-256: 19b78285e797ab188cc7c609abfd5ac3b523fe76a71e5d613f4c50b2f741aadc
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 0.9998

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://traffset.ru/aws?keyword=red+sox+world+series+trophy+tour+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f884b9344b2c.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/9acc31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5f943cb6a7b4b.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/tizus-busewaluvax.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/suwizasunisixi-ninefebawegem-ronoguwatuki-begodubo.pdfIn PDF document text
    • https://fuloremazugad.weebly.com/uploads/1/3/4/3/134356453/4453578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f8db32e131d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_5fa7da3bed920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fa2a5d5117d0.pdfIn PDF document text
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/xidado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f96c6ef3bd49.pdfIn PDF document text
    • https://dududizenipurij.weebly.com/uploads/1/3/4/6/134651263/616936.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/jebupofedijakuk/nirevobutowikot.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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 5220 bytes
SHA-256: 650a8d7b1566ae39c03161e421facfae63db8627425690b38a0e7be48d6eb778
font_01_sfnt_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 10936 bytes
SHA-256: 4126e5edda97a9ef0d6ab19c1878798baaa79a546699c5014cb46e7438ed427b