Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b4f1c14020075b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-24 08:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 90b7bc64e7fdfe11e6dea38eb9efb5e0 SHA-1: b7a36d2c735d11edca2c112146ba9e9764119c4c SHA-256: 69b4f1c14020075bd25e59b6e2448a34de4733144ff03c8415e0a36f6785f74d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to a domain associated with SEO spam and phishing lures. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags an image lure leading to an SEO redirector. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

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 lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wix?keyword=answer+to+a+subtraction+problem+minuend PDF link annotation
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/206062.pdfIn PDF document text
    • http://kigurumi.org/what_are_prepaid_expense_accountsh9fuz.pdfIn PDF document text
    • https://vemanilulo.weebly.com/uploads/1/3/4/3/134378365/nubofo.pdfIn PDF document text
    • http://brettlockhart.com/22471224676ef9m1.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/vixuwogetiv/1996_honda_vt1100c2_shadow_ace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e87688d-4398-4b65-9099-efd7558c8bd5/gukosadebozitovege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f85618-7c4e-4e6e-a368-73968342d5f7/the_secret_rhonda_byrne_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/que_representa_el_escudo_de_la_bandera_de_costa_rica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221414ff-46a1-4a85-a45a-4df8f6fec3dd/livafujowexowutij.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/100_pics_quiz_flags_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a5899b-dbcf-463c-9e52-fcc90001057b/is_luffy_the_most_powerful_pirate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d586b56-b37e-4f56-8335-370595d81fd4/lanimofaretulowepukane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f3f999-8fbd-461c-b688-c33974cac8a5/78904345917.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/gigelaxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f46d7ac-f09f-4b7a-bac2-b0b4b2cd2d46/suguguwapulorogom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce38885b-24ea-4589-8dd7-0eec0bf95d82/19672159255.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/intra_family_loan_promissory_note_template.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_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 5440 bytes
SHA-256: 65513c62cc7ca187f9d5c877099b6793901308a71f9de95f1cdabd17d5441c41
font_01_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 10792 bytes
SHA-256: f195f26ea3e2888b49bf21d89d4f5cd9773e48eb45742baaeaefafddec19f48d