Malicious PDF — malware analysis report

Static analysis result for SHA-256 854baa785aa26a7e…

MALICIOUS

PDF

88.3 KB Created: 2021-04-07 08:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 61af0e8e64fb654ceae5b5d640f95ca0 SHA-1: b1267560e49b99cdc344456a45421b3404f6c6db SHA-256: 854baa785aa26a7e80b8bf4377efce4e1d8cb97c72f482694baf60784b09042d
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 0.9998

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://kuzutuzo.ru/wix?keyword=john+21+commentary+john+piper PDF link annotation
    • http://rumafelaneli.mygamesonline.org/12088042710.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/hbZgglB/ikea_dresser_recall_pick_up.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/gfvslfL/t-_mobile_login_issues_2020.pdfIn PDF document text
    • https://sagaragevuba.weebly.com/uploads/1/3/4/6/134685912/2b5f2e12b0ffa22.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/naposiwusamumir.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/iLP8xic/stackyard_font_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/fighyia/90694211329.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/guQWMWf/parukabipeperovaruxibuw.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/40481740712.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/ncert_solutions_class_11_biology_chapter_8.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/sales_job_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/bjaShbl/reelgood_streaming_guide_for_android_tv.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/download_acrobat_reader_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/ggjegeo/pibitejudejumejinipadebuj.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/tufogifujokeziw.pdfIn PDF document text
    • https://gigojajalul.weebly.com/uploads/1/3/4/3/134320096/9491527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_429cb7a2d1944bebbe96503c03109b29.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/5834895317.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_ea070e3f3d5643bfa308dbaefa8174da.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_f989327e749a4f73a0e9d4b6321a4df3.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_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 5316 bytes
SHA-256: a935a959d3ad1f08d7558ed7fd9306bbb0dd3faa7e0846adb9e8783551a2a83e
font_01_sfnt_off00012c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7E 11284 bytes
SHA-256: 5a814c29ef33bb339a7f64cc9c683e3cdc4c66a62fd9d6eb230303e9c76a958a

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