Malicious PDF — malware analysis report

Static analysis result for SHA-256 144d3dc2bc125ddf…

MALICIOUS

PDF

63.5 KB Created: 2021-02-13 05:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5b426b77f5015656898ca8cd57273137 SHA-1: 9e857b83e268567fe05c3064f1b7e86cc53612dd SHA-256: 144d3dc2bc125ddf37add3acea8017c0583da6d5e860754177b0f97c06efbd4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging techniques associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=be+thou+my+vision+citizens+chords+pdf PDF link annotation
    • http://bavunexebiri.iblogger.org/32456710487.pdfIn PDF document text
    • http://moneyindia.site/38856457242gvwsn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5fe241e418b74.pdfIn PDF document text
    • http://shortsomfj.space/ocean_dream_cancun_all_inclusivexk665.pdfIn PDF document text
    • https://sagakoto.weebly.com/uploads/1/3/0/8/130814189/fijetox-kosala.pdfIn PDF document text
    • http://likododolokopaj.iblogger.org/verbos_uniformes_biformes_e_triformes_em_ingles.pdfIn PDF document text
    • http://it50save.info/jikatafigomatugopamudajefzff63.pdfIn PDF document text
    • http://winwites.space/66797245341gktkz.pdfIn PDF document text
    • http://mebets.xyz/skull_wallpaper_for_cell_phonespq1v0.pdfIn PDF document text
    • https://dosijikapok.weebly.com/uploads/1/3/2/6/132682778/559068e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475875/normal_5fcb24e45ae78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_5fd9bf1aad77a.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/ea445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fc5e9d4937b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexelipenaporux.rf.gd/70781273442.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/32171659818.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/pujizekusukatitaxuvoxo.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/sisad.pdfIn PDF document text
    • http://zekubegem.epizy.com/vabosexokivijasur.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_off0000bba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA9 5412 bytes
SHA-256: 4b0d5b8dfb970181f65250e5a59dae68c0e365f05b9c00d43835a9322ac06781
font_01_sfnt_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 10140 bytes
SHA-256: b46f4a3963429524f29db5de5c1760a58cdb59c286f414e94decc6330bcc0a9b

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