Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef44956a541c796f…

MALICIOUS

PDF

42.8 KB Created: 2020-11-06 01:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2e9ff103dd54aec6265e61aab0385be9 SHA-1: da5937dbf31df1106ebe3cb532e87043b27b838b SHA-256: ef44956a541c796f88c234db5d94d1808be1d6262826ef9b3e539f9272cbe9bc
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The primary URL, 'https://traffnew.ru/aws?keyword=prudential+401k+login+options', indicates a phishing attempt targeting Prudential 401k users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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/aws?keyword=prudential+401k+login+options PDF link annotation
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/656323.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fa459bcddf9a.pdfIn PDF document text
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/35a0afeaa.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/popodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fa0c1cc7eb25.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/f29ac2b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fa488ba0aa66.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/92efc7b2541.pdfIn PDF document text
    • https://xedutogozazinar.weebly.com/uploads/1/3/4/5/134505586/9303312.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/329dc398df407c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_5fa1b0f882108.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/lijopavexanuse/bsc_cbz_notes_1st_sem.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_off00006845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6845 5472 bytes
SHA-256: a5ef4646e4ded294a5adba82a254278244b6017aa082e4d01f84c8dcff83fdce
font_01_sfnt_off00007afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFB 10260 bytes
SHA-256: 125ac3d88818702acb3e608c6f66c2f2f9f2c9ca16480d332b1a0a60bff2c088

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