Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe9b155619fb8a7…

MALICIOUS

PDF

78.8 KB Created: 2021-03-02 22:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 43c4a19bb762688b013462f238a65b73 SHA-1: 0efc15b38688c8e2914a6ce43da1693b50bfb70d SHA-256: 3fe9b155619fb8a7e48da05c5ea174a4b7bb1a88a401d2314e01b27a5e0539ca
186 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. 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-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://zajinet.ru/123?utm_term=epson+nx230+wireless+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481423/normal_5fe6ed0a25452.pdfIn PDF document text
    • http://bonusiotsbera.online/pdf_to_image_converter_free_download_for_pcxql9n.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/745ab.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/meranagudikik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5fd3362f67d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_5fd17a253fb18.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/910529.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/suvopili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_60155383cba96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_603744ed63474.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/5546605.pdfIn PDF document text
    • http://myyshooop224.site/19705102694o086m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389586/normal_5ff7e2e9294fa.pdfIn PDF document text
    • https://sewigemebovoneb.weebly.com/uploads/1/3/3/9/133997870/webebotulawata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_60261233c295d.pdfIn PDF document text
    • https://jevavawawoj.weebly.com/uploads/1/3/4/8/134885319/wizivexivamij.pdfIn PDF document text
    • http://table-wait.com/titejekifofigiruwemizoysjpg.pdfIn PDF document text
    • http://jakartapro.xyz/disney_plus_hulu_live_bundle_pre_orderl9urc.pdfIn PDF document text
    • http://instofficial.online/netflix_stock_dropped_16_billionuw98x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuvuzoruzanawip.epizy.com/75770663677.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_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 5156 bytes
SHA-256: 2d3e8f1e26f8d1ee00dcaa07d2ecb681dd99157e5500e7fc760d43debad2ca1b
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10760 bytes
SHA-256: 95d4f8a6e2ee19f46aef8cb399ff97bf123dea4fea1906e7765690667dc087c7

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