Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96b977af3cca0d5…

MALICIOUS

PDF

67.7 KB Created: 2021-05-25 00:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b9ca7cf10fb392c9110d6f19e0591b SHA-1: e678895b7db8d2a2a881eb63be1cdfb46e96b99b SHA-256: e96b977af3cca0d53e93100c809980cebab972dfb8dcf844a17a29f9df5c254a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain ('pelibifir.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=night+elie+wiesel+worksheet+answers
    • https://vezajufarazigur.weebly.com/uploads/1/3/4/2/134265717/fubirilo.pdf
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/1523cbff97eee7.pdf
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/1687631.pdf
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/sidoxox_gipivorijemunaz_tomekosunon_sugiwuvuzajoxuk.pdf
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/zevijewil_zisenanigiliz.pdf
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/mavatito.pdf
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/6652976.pdf
    • https://zigudawaza.weebly.com/uploads/1/3/6/0/136035030/9143391.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c32bb2e4-d5c1-4882-ac6c-48ba3b65f97d/how_to_reset_maintenance_light_on_2005_honda_civic_hybrid.pdf
    • https://s3.amazonaws.com/mozedijiz/capture_one_pro.pdf
    • https://uploads.strikinglycdn.com/files/69c09695-c00e-4a71-be26-2e2fd04c666c/13447200328.pdf
    • https://uploads.strikinglycdn.com/files/91cfdc59-cb8a-4bb3-8440-39304d532787/galofotizufotumefajini.pdf
    • https://uploads.strikinglycdn.com/files/44f37f45-2c27-4bd9-b68d-012f64c9bedd/guxaradamiguxoroz.pdf
    • https://uploads.strikinglycdn.com/files/e19d6f27-11c1-43fc-b2c0-c5448329caf2/71031862248.pdf
    • https://uploads.strikinglycdn.com/files/84e4b106-9580-4b6f-b840-a71448bfa21c/sandisk_clip_sport_go.pdf
    • https://uploads.strikinglycdn.com/files/c10ea9e1-c87b-406d-885d-3fa771400578/nanatsu_no_taizai_movie_english_sub.pdf
    • https://s3.amazonaws.com/vavale/modern_kitchen_cabinets_design_software_free.pdf
    • https://s3.amazonaws.com/piwanisaj/54970027851.pdf
    • https://uploads.strikinglycdn.com/files/7d9c7a21-b79d-43dc-aa4e-0b9b329da47e/percy_jackson_is_a_egyptian_god_fanfiction.pdf
    • https://uploads.strikinglycdn.com/files/6fcdeb46-64ff-4a05-831c-462e8183709f/live_stock_market_down.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/buxirokos.pdf
    • https://uploads.strikinglycdn.com/files/a87d64d1-c325-4f74-9ecc-626a5844038f/garmin_etrex_30_os_maps.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_off0000cd71.bin
c453432301abc080bd3ea9b0b436b34eafdd969ab10aa60fe933736bc9aa50e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 5072 bytes
font_01_sfnt_off0000dec6.bin
810d0696997b36a6f7c9190389d87a4619274685514b8aecdbb771ca1242ec2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10116 bytes