Malicious PDF — malware analysis report

Static analysis result for SHA-256 4730676b29287c79…

MALICIOUS

PDF

76.2 KB Created: 2021-02-21 12:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f546ba1274a7a36006b0f197f9222dd6 SHA-1: 754c02e6e3a1842be120d3192995feb4a5c06a3e SHA-256: 4730676b29287c794c0b93e41521d451a9bfa64a8defcf28882dc9f2341f8aca
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=is+babish+a+good+chef PDF link annotation
    • https://gonagulinifuf.weebly.com/uploads/1/3/1/8/131856247/vaxolibuzagomu_kapovanadek_gufixu_gapubonowe.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/pemepatamis-seruzamefuber.pdfIn PDF document text
    • http://fb-pageunderreview.com/ronafifarag3eldd.pdfIn PDF document text
    • http://mail-autoscout24.net/19095437867wkcda.pdfIn PDF document text
    • http://goproonly.com/kukirax8woj.pdfIn PDF document text
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/5019812.pdfIn PDF document text
    • https://wipolupenigikof.weebly.com/uploads/1/3/2/7/132712614/958034.pdfIn PDF document text
    • https://losirasi.weebly.com/uploads/1/3/0/7/130738883/simunutova.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/2474460.pdfIn PDF document text
    • http://psylath.com/activia_black_cherry_nutrition_informationv9j6j.pdfIn PDF document text
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/povogoseni.pdfIn PDF document text
    • https://tipipiteker.weebly.com/uploads/1/3/0/7/130775441/2472064.pdfIn PDF document text
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/wobevopupumubasib.pdfIn PDF document text
    • https://kuledeju.weebly.com/uploads/1/3/0/7/130775905/bexupasu_fanifowig_tudovonipub.pdfIn PDF document text
    • http://cmbespaceclient.xyz/dixemobozugukifisinv0p5.pdfIn PDF document text
    • https://vudubigudimuw.weebly.com/uploads/1/3/4/0/134016717/2659506.pdfIn PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/dimurisijigitapada.pdfIn PDF document text
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/bogomu.pdfIn PDF document text
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/mazowokonipoba-basarumuvasiz-xoxapebigu-towazeko.pdfIn PDF document text
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/wigeju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 5232 bytes
SHA-256: d775b59aae451c50592e3635e14c6fef1427819a7a2575b34c06991daff20a23
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10736 bytes
SHA-256: 95afdda9c4ca0ef5f2f9a9446aa5fc667fa61089fba900bc3c9f6279e04acf82

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