Malicious PDF — malware analysis report

Static analysis result for SHA-256 e456f4edb700024d…

MALICIOUS

PDF

83.3 KB Created: 2021-04-02 01:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f4fb756da61180996d0d3c3f32d368a SHA-1: a263f50c458acb20a594064c039c2dab69f0e506 SHA-256: e456f4edb700024df85656220499d09db9313b37200ab05e541df054b37967ea
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. One of the primary URLs extracted is https://resalured.ru/strik?utm_term=crosley+deluxe+record+player+review, which is likely part of this scheme. The document's structure and the presence of numerous links are indicative of a phishing or malware distribution attempt, potentially using the embedded links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=crosley+deluxe+record+player+review
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/5303759.pdf
    • http://sobebal.22web.org/abandono_escolar_causas.pdf
    • http://vitetoka.scienceontheweb.net/add_subtract_multiply_divide_decimals.pdf
    • http://tobufasir.iblogger.org/selenium_xpath_questions_and_answers.pdf
    • http://faponabon.mygamesonline.org/contrato_consorcio_bradesco_automovel.pdf
    • http://wizatone.iblogger.org/a_beginners_guide_to_day_trading_online.pdf
    • http://jidameke.mypressonline.com/93398603359.pdf
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/1632122.pdf
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/2073056.pdf
    • http://saxosoxajivovud.medianewsonline.com/furujebalopakubiborir.pdf
    • http://sujisopoboraru.iblogger.org/download_film_rudy_habibie_2_1080p.pdf
    • https://belatefa.weebly.com/uploads/1/3/0/7/130775380/4845756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_002c752fd49f496d959a82504703af42.pdf?index=true
    • http://wufagezigedo.onlinewebshop.net/contract_broiler_farming_project_report.pdf
    • http://bixagolowetuf.rf.gd/pesowijubeliriwejoja.pdf
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_2c951020fd4a43d6b22d16223724b29e.pdf?index=true
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_fedba5db80924aef8eab85243a018371.pdf?index=true
    • http://rapedusuxatuko.epizy.com/what_is_the_weight_limit_for_a_pack_n_play.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_feee764dd4e049efbc81f8896a66b2a7.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_1ea7ba8ec61447a5b3d2f462802282af.pdf?index=true
    • http://rinurevidipefiv.rf.gd/hyundai_creta_features.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_off000106f0.bin
6976b8155a1eca3274442b09419ef8be40e4f38f7d97840b2438df832ef9b795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 5296 bytes
font_01_sfnt_off00011919.bin
249bae78119079f7b397374aad7ede2d506e274bc048bb99c924911a50929426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 12152 bytes

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