Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c1e5c6c93478e3…

MALICIOUS

PDF

49.5 KB Created: 2020-11-08 05:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 5451793a3f5458313c03ba891945d7b2 SHA-1: f460ef4f67efc8a2afc1812abdd5f97fcffec42d SHA-256: 87c1e5c6c93478e39907f7bea1edf9f07a07537855e271bb9b430f21d2ecd76d
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://traffset.ru/aws?keyword=milwaukee+brewers+spring+training+2020 PDF link annotation
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/5dc31.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/wubarewoni.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/nebomimut.pdfIn PDF document text
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/3351950.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/ragotituvamoniz_ronazuba.pdfIn PDF document text
    • https://zosevozosi.weebly.com/uploads/1/3/4/5/134527099/04d29431c661.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/zonivezada/pacsun_printable_job_application.pdfIn PDF document text
    • https://s3.amazonaws.com/sirasu/vixexar.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/user_manual_for_a_honeywell_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/wii_fit_plus_manual.pdfIn PDF document text
    • https://vuxuwavu.files.wordpress.com/2020/11/lirik_berkibarlah_bendera_negeriku.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/84559737052.pdfIn PDF document text
    • https://s3.amazonaws.com/vofosuvuwapiwo/42527017255.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/arbonne_vanilla_shake_recipes.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_off000067ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AC 5332 bytes
SHA-256: 8bb846dd42f64935869d2a95c27e3e17488183d9892eda28e8b13baff735573b
font_01_sfnt_off000079e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E8 15120 bytes
SHA-256: fc4af854023c03ce010d5a0d7fba14025ac850b8a8fa789e193c90934928e37b
font_02_sfnt_off0000a95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA95B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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