Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d2507c77ae9921…

MALICIOUS

PDF

75.2 KB Created: 2021-03-05 07:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 044128a1488deb28ac6cf79fca4aa37f SHA-1: d98dc1084d7566e196c0c3eb54973e9550bf097a SHA-256: 66d2507c77ae99216d24adce6c3ae02ffb968fcae730d27c49a8f84b6599c5a9
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'medical physiology', indicating a potential lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=ganong%2527s+review+of+medical+physiology PDF link annotation
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/lagaduruwokafu.pdfIn PDF document text
    • https://rujozakovupa.weebly.com/uploads/1/3/0/7/130776159/govuze.pdfIn PDF document text
    • http://trynutra.shop/how_to_reset_consumer_cellular_phonehwvdz.pdfIn PDF document text
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/giteziwaladen.pdfIn PDF document text
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/wudoleforijabufebux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_600d8c4547f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6037f26375a63.pdfIn PDF document text
    • http://sosed.market/gividujawelataxokebuwan7bpe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_6041587d87d30.pdfIn PDF document text
    • https://zijovegumasapal.weebly.com/uploads/1/3/4/3/134307166/3a1a542ba.pdfIn PDF document text
    • http://oneitshop.info/kegure0ni9l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380882/normal_600298456679f.pdfIn PDF document text
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/620ad71b.pdfIn PDF document text
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/vijamuxed.pdfIn PDF document text
    • http://monongzhlh.space/beggar_book_series_skyrimlg56a.pdfIn PDF document text
    • https://sugopubix.weebly.com/uploads/1/3/1/6/131637077/d3bf2e6345.pdfIn PDF document text
    • http://fullpisetc.ru/define_depth_of_knowledgehot5v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_22ea757ee60f4df793dd7e3db18c61ca.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_bb752597d36545959cfd4551c0444511.pdf?index=trueIn 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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5888 bytes
SHA-256: 44185ac2eb12b1d5c42c4d5f337b64a9456dc9ff84218222a8054f43695692df
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 10976 bytes
SHA-256: b43a206ad3f7e8145fb4d95810ea67ab9d54f338109add7dfec03635e940173a

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