Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63694a77f4a81a8…

MALICIOUS

PDF

67.3 KB Created: 2020-11-11 06:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b8073a04bf97e0a94fdbed70bf0d5473 SHA-1: 222d4e15b014e1fb2127515408d428b8aa09e01e SHA-256: c63694a77f4a81a8ca4a3a695250cb978ccb20e324fc75b97cf0f21871379968
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?keyword=fractions+in+words+form In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f8dc199b6deb.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/jokerekokeb.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/7985342.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/1174120.pdfIn PDF document text
    • https://vuzejugusu.weebly.com/uploads/1/3/4/4/134486163/5360985.pdfIn PDF document text
    • https://lizosodomig.weebly.com/uploads/1/3/4/3/134327767/pofumifuwew.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/cafd84665a2f48.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/fikajabarufov-pobaf.pdfIn PDF document text
    • https://wugemevafiditi.weebly.com/uploads/1/3/4/3/134382928/gexosuwiwitisezex.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/c4187e7.pdfIn PDF document text
    • https://jimoporifu.weebly.com/uploads/1/3/4/3/134378689/tukopimurufebiv_neturibipivodit.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/246df1eec6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juduk/jadojifupuj.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/37189529262.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/15497743960.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/14469598702.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 4852 bytes
SHA-256: d16c239992305d7e1e043685e18d11c0b50afd9a417e2471c230eb680fad31bf
font_01_sfnt_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 10944 bytes
SHA-256: bb0e99aa7db551a1b32c7013b54503ecd754f6cfd08bcf860a2b2d3ab19e67e2
font_02_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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