Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a46e1386300835…

MALICIOUS

PDF

74.9 KB Created: 2021-06-08 20:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 46ffa4ed6d1c7bae6b3d3c2df1e226de SHA-1: 455fe8967f5caf2e097427f9ec88d27ac4ccb084 SHA-256: c8a46e1386300835009222a641f75bb9dbee20f2f0847c56e8dac41cfc312bb2
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious or spammy content, likely as a lure for phishing or to generate ad revenue.

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.
  • 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://infrive.ru/pbw?utm_term=successful+entrepreneurs+profile+in+ethiopia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486351/normal_605281d9ae23c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fdc6461e19b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_60b90add9ba44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_606e8840c53d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6039ad7cc3d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_603af44687eeb.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/silaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470830/normal_60397344a29c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477376/normal_5fcc49df7ff06.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/jexeguto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475715/normal_605010d700f8b.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/de72ea26be8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximusutoj.pbworks.com/w/file/fetch/144746871/the_magician_the_secrets_of_the_immortal_nicholas_flamel_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c360159a-278b-4463-8b19-28a3d61f6078/raxipufib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76242df7-8ab4-4a02-9282-45561f6557d7/35451862406.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/97570837480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56352e18-264d-423f-8369-61fc1756a9a4/fetuvagenosusanakiwi.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144884100/81637213040.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144419127/bsc_physics_handwritten_notes.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144872559/vitawukagigivonikeka.pdfIn PDF document text
    • http://dufogeruzipu.pbworks.com/w/file/fetch/144733590/download_spotify_premium_gratis_versi_terbaru.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_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 5344 bytes
SHA-256: 0243a401719d4ee4e5296dbf1ba3d0c867c41720e2d27b23fb406ff933292630
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 10500 bytes
SHA-256: ad6f23a0cdd2204c8710e39fe65bc49006ee40a93a427c5090f1512bcfad2c45