Malicious PDF — malware analysis report

Static analysis result for SHA-256 288b67ef5860263d…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 06:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7fe511a2635d9823a363224c4ba6a6e0 SHA-1: 0a1b75fe858314661dd644e336b616d83eee88be SHA-256: 288b67ef5860263d90d45f35c67909dff98ae7ae9a0611b064249c9663018fec
164 Risk Score

Malware Insights

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

The PDF contains a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML confidence score, indicating malicious intent. The presence of a large number of external PDF links, including one to 'golowaki.ru', suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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://golowaki.ru/strik?utm_term=build+shooting+target+stand PDF link annotation
    • https://cdn.sqhk.co/renerolodepu/gjhCjgn/nuvisozafunibakuxuj.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/7552562.pdfIn PDF document text
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/0d90bb.pdfIn PDF document text
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/f672c62c.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/KgiA3Hs/viwawatirasekiwikexaxozun.pdfIn PDF document text
    • https://cdn.sqhk.co/saboretiki/zjh9gej/musikizozugo.pdfIn PDF document text
    • http://erogan-oficial.site/infernal_war_machinekhrir.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/jgdd4MY/90444531682.pdfIn PDF document text
    • http://buytoday.cc/kixuvupesqloao.pdfIn PDF document text
    • https://gubanezuwibudo.weebly.com/uploads/1/3/1/6/131606890/fasixopedebanas.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/kefiperizonofu/engineering_dynamics_incorporated.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/how_to_thread_singer_66_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/firelite_ms5ud_cut_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/the_monkeys_paw_movie_comparison.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/cemento_dental.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/tufonawubawanosu.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/19114645863.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/light_brown_color_formal_shoes.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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 5136 bytes
SHA-256: 2baf9b8886de2e979bde2e19b191dee62d4a387fcd9d98865ac0efc96d66e100
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 11080 bytes
SHA-256: 1aef3295816768efc8438cd7eec83b9c58b64ec26d24a28b57cd424e3dbbbf9d

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