Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5629cfb1ce43b75…

MALICIOUS

PDF

97.8 KB Created: 2021-03-18 20:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 674f5348bb3dd9d8b2145a5b0f1479c0 SHA-1: 5ef6553c6dc5cec7950be03f7daa1c489f078332 SHA-256: d5629cfb1ce43b75592935c1550fd6d5ef501f4990b445f413d3011c52b914e3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=algae+biofuel+production+process+pdf PDF link annotation
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/6041522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_604ef41ad3364.pdfIn PDF document text
    • https://kojezuduw.weebly.com/uploads/1/3/5/3/135326104/228916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419433/normal_5ffb1cfb4e191.pdfIn PDF document text
    • http://nizuloxodiza.iblogger.org/fegovudez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6019afc070af8.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/mutuvapejuk_susik_xopuboxeto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f191092a-6486-4b15-b872-942c62c5d6d1/45175312669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314be18b-c127-47b6-ab93-2e9c03726cb1/spaghetti_tower_challenge_rules.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/how_to_install_apps_on_ti_84_plus_c_silver_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e605737-5fc1-4423-8297-af8795456dc7/xukakov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89344a9a-dc31-45c8-be43-95bf27415ef7/how_much_do_first_year_flight_attendants_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31481f2-d646-4c10-acbe-bd8b961251ce/corsair_k95_platinum_lighting_profiles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249d57b4-2af4-44b1-b764-542314700903/detuzinup.pdfIn PDF document text
    • http://renisibupo.rf.gd/nisalatepis.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/nbos_character_sheet_designer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e67e7c-8516-4dd7-b5f1-9bcecd5f44f5/vogetu.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_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 5332 bytes
SHA-256: 73bc2d2e70c7fb4b880a35a0124bb96c92123a2ef51438b3c08f20b528e35923
font_01_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 12416 bytes
SHA-256: dab8630eb9d0638fa28c97beae207deed69fbed0f2c097b4b490c241bdab4b45
font_02_sfnt_off00016bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361