Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edd2e1c6cba5aaf…

MALICIOUS

PDF

77.1 KB Created: 2021-06-06 01:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 79dd333cc27253badfb57d17e799e513 SHA-1: 4059cf58130fc11b0adbebb07db83f550bed3ae6 SHA-256: 5edd2e1c6cba5aaf59cab278fec1eb5715d11fce50f4ae88c8627e210aa56cf2
186 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 pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cructi.ru/pbw?utm_term=attack+on+titan+season+1+intro+roblox+id PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452154/normal_5fdf7735b48b6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389809/normal_60b2df7b710cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487623/normal_6013abdb08bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_6065c410e9588.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/wujalume-fuwipuvelake-budezeluvuda-woxuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_604ed4f95891d.pdfIn PDF document text
    • https://sekirunive.weebly.com/uploads/1/3/4/4/134404638/848209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_606a1e77e2432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_60bbf776cdbd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472481/normal_5feb50045d7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_601f38fbaf5e8.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/6fbb7090-a5d3-4b09-b292-1f7c76f6b9b6/statistica_7.1_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96339ce-86a6-4600-b5c1-71075252bc48/how_to_reset_ozeri_bathroom_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ffebcd-688c-4b9d-85a1-412e9d1e7625/where_to_buy_zippo_lighter_fluid_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e5eb5d-2987-40f3-b2ed-445a4b6b577b/think_python_free_download.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144535203/mac_address_changer_android_download.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144432756/26806621587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239143de-2dcd-4325-b917-107252019c42/how_to_start_electronic_repair_shop_new_london_wi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180c29ae-aba2-4684-b5a3-1527be7c1e10/how_much_does_it_cost_to_ship_a_30_lb_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92512f3f-d73e-4027-9f62-11bf29b6e585/list_5_elements_of_poetry.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144689193/download_age_of_empires_2_hd_edition_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18657eea-1884-4699-b20a-24c0b210d787/94198125819.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/suvalobemudit.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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 3780 bytes
SHA-256: b44788276187b20abc986dbe65a99c5fdcac385b03828e253f6ff527d8685476
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 5248 bytes
SHA-256: fd98a1658d5b1bf75eae9fb1fafd384f77bd7d7150e2e9f87793aacd3fd8e0e5
font_02_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 11188 bytes
SHA-256: e5691fabec007cddbe419a0a2116f8f100fd9f7a3bd7a2923a0fd6786abee047