Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa322b69540ebab9…

MALICIOUS

PDF

77.0 KB Created: 2021-02-26 08:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d02e411be25fb42d735b3616005bb9 SHA-1: 1a660c71af2f0cac7058e4f02124e038fdab39c2 SHA-256: fa322b69540ebab9c2f13cce640be165c303c4b0ddcffb777d98797cea2a4cd4
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to attract traffic or distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/wix?keyword=ukulele+songbook+pdf+2019
    • https://dapifakefigev.weebly.com/uploads/1/3/1/6/131636612/3495970.pdf
    • https://cdn.sqhk.co/derixosu/iap9NWn/pifokadek.pdf
    • http://servisvds.ru/how_to_apply_for_business_creditmi42n.pdf
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/tegibikabikos.pdf
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/kevivufe_gamawuzaneko_nanezegarumej_romexapobibu.pdf
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/6493ac7493ec.pdf
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/9211860.pdf
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/3607472.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/wirurefivip_femaro_xuloxuresamu.pdf
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/1462463.pdf
    • http://cmb-societe.com/69196658552xr905.pdf
    • https://cdn.sqhk.co/lorotukogof/jblSAji/origami_rectangle_box_instructions.pdf
    • https://vibupawovilopi.weebly.com/uploads/1/3/4/3/134377541/pegawarenifili.pdf
    • https://cdn.sqhk.co/tedubifo/heCjggh/38758877839.pdf
    • https://cdn.sqhk.co/palevisi/fig3Sn0/cardboard_connection_funko_pop_overwatch.pdf
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/9a913ff4b9396.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jodetiwozefiso.epizy.com/organic_chemistry_practice_problems_with_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05e.bin
327a5d176b6e0d8cd7988caaf82c4d42cb4cd448c4562afb1b3d624322b20e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 5580 bytes
font_01_sfnt_off0001037b.bin
968df6f90f29b5e26bdd44563a6acba698dca8b844bc112d0c33129322885e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 10496 bytes

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