Malicious PDF — malware analysis report

Static analysis result for SHA-256 628e5c867bc80327…

MALICIOUS

PDF

80.7 KB Created: 2021-04-05 01:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6659e5d6e9331950b55e0f7716add42 SHA-1: 7f2af2890cdf23f3949a0413b6f7b7e4338a89dc SHA-256: 628e5c867bc8032767be8e7bc47d86be0df0ae5cec86230405a3272a0377c4e0
156 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 of which are SEO-optimized and point to various PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=honda+hrc216+owners+manual
    • http://minesaxofunawi.getenjoyment.net/philips_norelco_aquatec_at810_charger.pdf
    • https://cdn.sqhk.co/wareberefiz/9iipjfE/sirogupurok.pdf
    • https://cdn.sqhk.co/voxedijudibo/hNiAfI0/binomial_distribution_word_problems_worksheet.pdf
    • https://cdn.sqhk.co/lusimalifa/ihZjjuu/38022369462.pdf
    • http://plafond.xyz/troy_bilt_horse_xp_46_deck_belt_diagrame1thw.pdf
    • http://vvinorama.fun/internal_combustion_engine_purposexsvof.pdf
    • http://nijepatexosanus.medianewsonline.com/telecharger_journaux_algerien_en_gratuit.pdf
    • http://hellesypakk.online/international_business_degree_specialization4ukgh.pdf
    • http://raisinsapp.pro/38295099084amn0w.pdf
    • http://winnerslm.space/96814128185j6vgx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_7365d35b17284f3184581dfc26d4cecf.pdf?index=true
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_f7fa6424675a40e7948add142e881635.pdf?index=true
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_85baf3499911401983094f6385ef10ae.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_82656306235148d890a94e072c7808b0.pdf?index=true
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_fbe1b771feaf4f579da316b6221ee964.pdf?index=true
    • https://uploads.strikinglycdn.com/files/096d2f28-64a7-419e-b3e0-452d0572050c/dejubunimuwajidevubafunul.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_afbc2ef84e084c1f8f71a9a171c341be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a94763b7-d6fa-4b1b-ac84-021f776d1967/soil_mechanics_in_engineering_practice_by_karl_terzaghi.pdf
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_922830f95c884f24949c70daba43a6a3.pdf?index=true
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_8246f74a70bc445394b3db8c1aa17daf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/09d33b28-588c-450f-b69f-55c18fa0925d/business_mathematics_and_statistics_b.com_2nd_year.pdf
    • https://uploads.strikinglycdn.com/files/c7d49f48-094c-4d4b-92c7-4f3a27d44c33/nikon_p-223_3x32_rifle_scope.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_4fe65a49d31b49d28db4ee14e0f8bb97.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfe.bin
855ca6463f2f58c5afec842cb3834935758f2c322ffff3fb4df8e5bc614f1921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 5324 bytes
font_01_sfnt_off0000ffef.bin
359c9164d7f9bb7f8b06758449f3e399723d887a6ea5643b38dde464809793d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 11096 bytes
font_02_sfnt_off0001259f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 4324 bytes

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