Malicious PDF — malware analysis report

Static analysis result for SHA-256 05de4091cea73cac…

MALICIOUS

PDF

83.4 KB Created: 2021-03-02 02:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 33f26036d655ef10a4f8c4a200e81a4d SHA-1: 45813e7d52639e438a680cd34abd7fdc67f26fe3 SHA-256: 05de4091cea73cac735e70195c1068a14f9dca239bf058d27d23987c46e9e466
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. One such URL is https://xajibur.ru/strik?utm_term=td+jakes+book+let+it+go. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection as Pdf.Phishing.Trojan indicate a malicious intent to phish or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=td+jakes+book+let+it+go PDF link annotation
    • http://copyright-help-report.com/what_mental_illness_does_lennie_small_have69ceh.pdfIn PDF document text
    • http://jakivuxevova.22web.org/17942353392.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/bYgcjgn/dalube.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/ja8gfN3/muwepove.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/5784504.pdfIn PDF document text
    • http://nout-prokat.website/32366500781seycy.pdfIn PDF document text
    • http://chambreapp.xyz/639882131514rdfm.pdfIn PDF document text
    • http://extrameets.fun/zimsec_past_exam_papers_a_level_geographyzv3if.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/bGjif0O/fezowekiwewadolorogixazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lamavij.epizy.com/85697869137.pdfIn PDF document text
    • http://jujonejetas.epizy.com/67187051109.pdfIn PDF document text
    • http://dorenibe.rf.gd/77699000989.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/rufej.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/addition_worksheets_for_1st_class.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/precalculus_domain_and_range_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/32801700935.pdfIn PDF document text
    • http://gafoxipebivama.rf.gd/caracteristicas_de_los_personajes_de_la_novela_cronica_de_una_muerte_anunciada.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/vajedibufogagarumaxitud.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_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 5128 bytes
SHA-256: 3f67abc62d03f09de023fe44a2ec8b9c21994330bdfe61a73d7484c1c0912441
font_01_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 10388 bytes
SHA-256: 3f6ca87f350e337a29bffb74cea81a493e7c7e184c2b8f762278b73807f30af9

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