Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad311e7ea9b749f9…

MALICIOUS

PDF

81.4 KB Created: 2021-05-27 08:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c05b7b7f09d83a53b1ebe251a2f5cab0 SHA-1: cfe5317592c46df0d91aeffe008cca7533036eb8 SHA-256: ad311e7ea9b749f905da071b4c98aa68fc4b37aa000f25f2400d848ffb3bdb82
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector URL (https://botokaw.ru/strik). This suggests a link farm or phishing attempt designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=what+does+emphatic+mean+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5fd182246dd3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_60339d45a8f21.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/viwusovigijoma_jegukukezipi.pdfIn PDF document text
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/makuduj_pabuj_jakowovimagi_nomekar.pdfIn PDF document text
    • https://bojotipawotos.weebly.com/uploads/1/3/2/6/132681617/194914.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/1227c.pdfIn PDF document text
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/82be5d3520c1b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89b79e0-26fa-42a4-b9f8-661c6a0103b8/amana_front_load_washer_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1786cd08-b691-4193-acef-666c03aa0ab8/bbmas_2019_full_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4350d6-279c-4196-8a3e-0f964b89d3c8/gestational_diabetes_blood_sugar_levels_chart_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b78a668-703a-45cd-9e96-7704c6a82c73/50625307580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880d890e-5f47-4526-a8ad-0fcfee65df45/how_to_install_bodyslide_skyrim_se.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fea0a89-ddff-40f8-8eca-b6291487b167/murumanutuluzam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee93f53-e132-4cfb-b315-d2bc0eaa3f61/zemivuxarepima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be05174b-3b90-472a-9039-504e5d4e598f/software_project_management_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90660e56-8276-4950-b14b-532f88f2e477/diferentes_tipos_de_ficha_de_leitura_existem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba6f967-7c0c-4ff5-a282-c0a38d882247/what_is_the_theme_of_the_book_night_circus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8b29a3-4413-47c2-b9ef-0c75f00b7c2b/37242885411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09cd8cb1-662a-4f82-bccc-3aa98440b0f7/download_game_flat_zombies_defense__cleanup_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db4e947-e329-4092-bdff-72ed3cce76be/personality_test_based_on_colors.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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 3584 bytes
SHA-256: 886e2492a5824f1f5affa9e1445a4ed142904e23ea27b72bf404346d37be0364
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 5404 bytes
SHA-256: 0919dc1c3837fb44ee788ca05c0cccb19d7beae56d35271eed0106498f0425e1
font_02_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 14192 bytes
SHA-256: 475107eecd70e2100df0b6b7fbb7d0b90d24b1863c5d86879b0922c4cc42403a