Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88a0deee943cbf5…

MALICIOUS

PDF

78.1 KB Created: 2021-03-03 23:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5cace6e4e7c90653ed7311a83bcd07c4 SHA-1: cabc60547826b3a261ab2dc48d9d4f080a31b3ce SHA-256: f88a0deee943cbf528d41c31eaeb5693741a5ef6e1fbb0760d39c378a66d1589
196 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and numerous suspicious URLs are indicative of a malicious document designed to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://soxebez.ru/wb?keyword=casio%20entry%20level%20pcr-t280%20electronic%20cash%20register%20black PDF link annotation
    • http://loginwithfb.site/dumifiwubaliqqyst.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/epson_nx230_printing_blank_pages.pdfIn PDF document text
    • http://itdiscounts.info/zekoxepimodivoliladonemiupiyl.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/why_do_i_feel_so_hurt_by_my_husband.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/vivaretab.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/cAjhDsH/45900937210.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/dewalt_drill_bits_at_lowes.pdfIn PDF document text
    • https://cdn.sqhk.co/tonuviwa/MfrIojc/destiny_s_child_christmas_songs_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/2hb4Bgc/adversaire_synonyme_6_lettres.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/togefamuwumasuve.pdfIn PDF document text
    • http://getsol.xyz/as9100_rev_d_gap_analysis_templatebwxnx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dugibabafod/bobogudulidasewivifisusuw.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/daximazoximifemozo.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/como_colocar_anexos_en_un_informe.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/woodlink_platform_bird_feeders.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/92326916005.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/algebraic_identities_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 5872 bytes
SHA-256: 088d9ea273558d0cf388d72e73cdb9f66d6c3123d72545a400c7387f704a104d
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 11260 bytes
SHA-256: fced9006b288f58dae2345e2e2305462e2df72159f44f2f0846ce07eefdf9179
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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