Malicious PDF — malware analysis report

Static analysis result for SHA-256 910c398039db07b9…

MALICIOUS

PDF

85.2 KB Created: 2021-01-30 19:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c79eda7253c11ba992fbe7a1af2f8aa2 SHA-1: b19c5892eef796521cb376e10ab43618b08ad7be SHA-256: 910c398039db07b9e3325e997e543fde7ee9dc7c1bf78ed08bcca3469b62ea68
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to PDF files hosted on Weebly and other platforms, indicative of a link farm. The 'PDF_SEO_LINK_FARM' heuristic firing strongly supports this. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to potentially malicious or spam content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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://leonvi.ru/123?utm_term=gen+7+pokemon+go
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/9537072.pdf
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/2031683.pdf
    • https://jegumozapibalan.weebly.com/uploads/1/3/4/0/134013344/b45714.pdf
    • http://rankingcoach-seo.com/60123439583psv89.pdf
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/1144ef5.pdf
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/cd2de2d5d9.pdf
    • http://regse.website/second_hand_electric_guitar_for_sale_near_meoxgb0.pdf
    • https://sisajubiji.weebly.com/uploads/1/3/0/9/130969075/a999e3.pdf
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/83f8984f4f.pdf
    • http://toppiksnack.xyz/siwubik4tkcy.pdf
    • http://bitsracing.net/zasavilalur6rnca.pdf
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/zinijegozutat-judas-vanojovuzep-xivosilajewoj.pdf
    • http://matroskin.space/gomuxer5yyd3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/towakog/90383073309.pdf
    • https://s3.amazonaws.com/zopenave/antony_and_cleopatra_bangla.pdf
    • https://s3.amazonaws.com/vixuwogetiv/kejesorepewimirugoru.pdf
    • https://s3.amazonaws.com/bepukuba/banuriv.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/57402513045.pdf
    • https://s3.amazonaws.com/tuzakifezara/81730887346.pdf
    • https://s3.amazonaws.com/megulu/arma_3_dlc_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f613.bin
68318b6b4a5066b12c151dbd05fdc8b4872590eab3d2f3cdf1cbcdb01a82682b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 3664 bytes
font_01_sfnt_off0001032f.bin
947b5c65efc288934a740861f86cc44c4316975d2f0ac34b9b4155eff6e724f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 4456 bytes
font_02_sfnt_off00011245.bin
87983ae12985da0c7cbf25db5da6a1a13d36b1b8a040f3c0fe4b570cff1a0dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 11040 bytes
font_03_sfnt_off00013791.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 4324 bytes

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