Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9ccc1c58142e42…

MALICIOUS

PDF

72.4 KB Created: 2021-02-03 23:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bc35e55ff0fabd197b861e943da0f6b2 SHA-1: ce016dd41359a0c00b7d31bf0b1cca96a7de7ed2 SHA-256: ff9ccc1c58142e42ce28fcc3856648a8db02408b835977112d209320a09f83bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs points towards an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the sheer volume of outbound links is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=periodic+table+puns+answers PDF link annotation
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/9634279.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/424131.pdfIn PDF document text
    • http://idealica-italy.site/bazagubube9d5h2.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/gjangij/background_images_windows_10_mail.pdfIn PDF document text
    • http://copytoshka.ru/hits_100._9_aruba6tj8i.pdfIn PDF document text
    • http://vikidavilor.22web.org/mogisazineduwomo.pdfIn PDF document text
    • https://lipodemofuxe.weebly.com/uploads/1/3/5/3/135316225/pewepaxagunavo.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/gekekowujid.pdfIn PDF document text
    • http://naykaryadom.fun/lajipitaduvinoniwupamuvahnyog.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/7135600.pdfIn PDF document text
    • https://xakolino.weebly.com/uploads/1/3/1/4/131453712/4647125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafolizol.rf.gd/89755505744.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/lilutelozoku.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/85771240632.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/graduation_invitation_templates_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/full_form_of_teacher_images.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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 5300 bytes
SHA-256: 0c58bf355fc5e8959a7cacb3c9877c0e9f597af80dda5c290005e302e74afcbc
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 10408 bytes
SHA-256: 217d5d15670eef2a6ef8344c8b2b976b13af8c572316993e0ab10718e7de9937

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