Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb445995f3e7ac5e…

MALICIOUS

PDF

74.6 KB Created: 2021-03-09 10:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 77a363563040aa2ac43e88bba4576de7 SHA-1: dc526df56fe151c2d2bf556f96e5e2d40e5190bc SHA-256: bb445995f3e7ac5e4a960967739c04d3c58bbf9efe65cc5ef9c7d95dab0f247a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a T1566.001 (Spearphishing Attachment) attack pattern, likely leading to further compromise via the linked content.

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 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://botokaw.ru/123?utm_term=ancestors+legacy+german+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5ff49a98b61e8.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/nugumokis.pdfIn PDF document text
    • http://f1l3download.site/88510330056r8xqu.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/nawitogawewexuxowujisume.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/piralafeniji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_6045037d627cc.pdfIn PDF document text
    • https://jedogivezuse.weebly.com/uploads/1/3/4/8/134862252/5704595.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/80599f84da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fef3c17a94c8.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/which_weight_watchers_scale_is_best.pdfIn PDF document text
    • http://ru-payment.casa/information_about_bugatti_la_voiture_noireq9xsn.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/divarut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pemukusa.epizy.com/finapesotanesekumi.pdfIn PDF document text
    • http://jikafazasakojob.epizy.com/90174057342.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/xudumewupira.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/competitive_marketing_analysis_template.pdfIn PDF document text
    • http://segimoto.myartsonline.com/lofijoviba.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/gabion_retaining_wall_design_guide.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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 5348 bytes
SHA-256: 12e3af6e1e9d68bb4ea321ba1895418641bdb74fe8b4cd4e4ad90c6e2b44d9f8
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10932 bytes
SHA-256: 4cd45197d7b7aa041addb28c52858840e175f8bdfb101b831a5e8d05f602f281

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