Malicious PDF — malware analysis report

Static analysis result for SHA-256 77407de2582c4cf4…

MALICIOUS

PDF

74.5 KB Created: 2021-05-24 08:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48019bb8b1476b3d29cf6461b2167f6e SHA-1: acb8cc002d534827b29340e5417ade8dedbb1604 SHA-256: 77407de2582c4cf4e1dc01915ad2f32486b69b09b2bba64ca9d41cb33b4cacf3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive external linking is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wb?keyword=what%20does%20distilling%20do%20to%20alcohol
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/noxavofe_fadoveziwa_vifiduxavemur.pdf
    • https://cdn-cms.f-static.net/uploads/4370525/normal_6040ea6ac370d.pdf
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/90a42f0e225c7.pdf
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/wipopotavev_sopesod_setamipowe_savez.pdf
    • https://tazivori.weebly.com/uploads/1/3/1/4/131438523/6872644.pdf
    • https://cdn-cms.f-static.net/uploads/4402940/normal_6038b4efecd22.pdf
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/972f9c4044b2b.pdf
    • https://fumimukewagur.weebly.com/uploads/1/3/5/3/135321221/favukibal-fumafedatuduvi.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/db71775c262.pdf
    • https://jigejoxipivigif.weebly.com/uploads/1/3/4/7/134731155/3056501.pdf
    • https://fobijolosa.weebly.com/uploads/1/3/4/7/134730704/rakozujazekak_pefekuxax.pdf
    • https://cdn-cms.f-static.net/uploads/4374688/normal_603f63124999a.pdf
    • https://wemogutidagumov.weebly.com/uploads/1/3/4/6/134669151/6673667.pdf
    • https://luxowodadobib.weebly.com/uploads/1/3/5/3/135325591/tuvibixukebiriru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14a43f18-0268-4f65-84ff-7345ccce34f1/how_to_connect_vizio_soundbar_to_tv_hdmi.pdf
    • https://uploads.strikinglycdn.com/files/e74af1ab-aac5-47d7-83d6-ac066763282c/72277092122.pdf
    • https://uploads.strikinglycdn.com/files/923d3693-feea-488f-a055-e42d06aa89f5/de_que_se_trata_el_libro_la_ciudad_y_los_perros_resumen.pdf
    • https://uploads.strikinglycdn.com/files/ed6c2888-9455-4feb-90ad-6c6aecdde390/how_to_pair_a_plantronics_c054_headset.pdf
    • https://uploads.strikinglycdn.com/files/304bc5b4-7d21-41ec-8b01-822859d2b360/old_world_map_wall_art_framed.pdf
    • https://uploads.strikinglycdn.com/files/394f5ef3-9c34-40a9-b854-dbbdb8b36b91/which_online_photography_course_is_the_best.pdf
    • https://uploads.strikinglycdn.com/files/0e2a2e60-a05f-4554-bdb0-a83a5c33d76c/how_much_should_i_charge_for_computer_repair.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e884.bin
aec038a4c679b36f2f2de1f235b313a4dba463f624829d70dd58d15a19173cd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 5116 bytes
font_01_sfnt_off0000f9fd.bin
b2d87af46dec17eea533e8d13c338a0a2b1f23bd2f0aa0c45370c1c83a806dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 10152 bytes