Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d3560bbff167c7…

MALICIOUS

PDF

74.9 KB Created: 2021-02-16 04:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 26a476f74f983f0b912b3a96e7bf642a SHA-1: 4197b168a99f600511bc9cfb5ebcb7ea3e6d04d3 SHA-256: c8d3560bbff167c7e7edc60e600568b5e359acab5ade456875a412ce171a3821
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which appear to be part of a link farm designed to mimic search results for free book downloads. The primary URL points to a site offering a download for 'How computers work 10th edition pdf free download', suggesting a lure to obtain potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=how+computers+work+10th+edition+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495696/normal_5fe12546aa982.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/16cea5f4d92c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_600204fe76b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_601a7dd227fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_600c899761f40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384039/normal_5fee512423a39.pdfIn PDF document text
    • http://moviesaddaa.online/26659950695ccwiu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xozeb/83088640047.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/gijunofevobu.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/14730460781.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/descriptive_research_design_definition_by_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/bavinoxekajik.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/mexet.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/49739019273.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/jiduzunosodisogamatovaz.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_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 5708 bytes
SHA-256: 4786a05a8604fcad4d63c0d85f4f4f6dc425d20518868d19c8fe0bc5830aeedc
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11148 bytes
SHA-256: c8b6eff5eeb179371df1e3cbd2084625e38febf86f12bbd1a3a44c9cf68c6685

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