Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3a69133c36aeb7…

MALICIOUS

PDF

74.2 KB Created: 2021-02-27 19:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 99d0206331c598cd88516d028bbb3f0a SHA-1: b0fbd0f2975a4dc5e869442024a1dd9b3b336619 SHA-256: 9e3a69133c36aeb7dbc7e8f7ccd1af6c2977b3b8430d097f16856167d500e8af
156 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 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
  • 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.
  • 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=how+to+arrange+ice+block+in+deep+freezer PDF link annotation
    • http://huaweistoreukr.xyz/31340915490h8za7.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/kepapubupufox_dataru_peluk_vugexa.pdfIn PDF document text
    • https://modurofeg.weebly.com/uploads/1/3/4/3/134376635/9204337.pdfIn PDF document text
    • http://remontnatali.ru/dunevanodujulidakzvczk.pdfIn PDF document text
    • https://lakaporizad.weebly.com/uploads/1/3/4/2/134234628/a06afdf92030db3.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/besuviruvan-bolekunaso-gamalalatawibuv.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/gexezekejuja.pdfIn PDF document text
    • https://neripekotijoba.weebly.com/uploads/1/3/2/6/132681370/rukelirejodin-lokeguxam-vevas.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/pemususulupurir.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/lotodow.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/kovezodepugov/oracle_isupplier_portal_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/rijux.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/aws_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/32586046419.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/aditya_hridaya_stotra_file.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 5452 bytes
SHA-256: 672187b6fe39bb4391604e648095f657047228a6f44849337edae17337a45f43
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10560 bytes
SHA-256: 8e6bae0ce03952998e5136cf417d81eec8740e9bfb738479e49f0cefa52491fd

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