Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e311aea1b28f5f…

MALICIOUS

PDF

86.2 KB Created: 2021-03-16 10:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 302d187f0e88b6a752f0a51e2c87fcb4 SHA-1: e332fe93002254234807de3c52e6f969df87e07c SHA-256: 19e311aea1b28f5f81c00d837c1f32f173851d2288bf419dded516d92bece7c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm. One of the external URIs, 'https://xezojetit.ru/123?utm_term=ecsa+fee+guidelines+2011', is flagged as unknown reputation, suggesting a malicious intent. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or SEO spam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/123?utm_term=ecsa+fee+guidelines+2011
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/7459061.pdf
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/xobalojibowedume.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/ffc5b61d1.pdf
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/fe9864a896cd511.pdf
    • https://dorixakogika.weebly.com/uploads/1/3/6/0/136051108/webekanozogipoxazig.pdf
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/4d378b18.pdf
    • https://fagojature.weebly.com/uploads/1/3/3/9/133987822/2585136.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lolaritemukole/how_long_does_it_take_to_issue_a_letter_of_credit.pdf
    • https://s3.amazonaws.com/retisovojor/zaferinovogufozala.pdf
    • https://uploads.strikinglycdn.com/files/b9024480-6d89-4be8-92ed-2c95c09596f0/what_is_in_the_taco_bell_breakfast_crunchwrap.pdf
    • https://s3.amazonaws.com/zarevizebi/oracle_database_sql_certified_expert_sample_questions.pdf
    • https://uploads.strikinglycdn.com/files/ea8ff43e-3eb8-4821-9ccc-2ea92f679ea6/84819376984.pdf
    • https://s3.amazonaws.com/lekelepowo/private_birding_guide_costa_rica.pdf
    • https://uploads.strikinglycdn.com/files/40e52043-7fc4-4031-8ac8-e1d1a1d83f9d/how_to_access_secret_samsung_tv_service_menu_code.pdf
    • https://uploads.strikinglycdn.com/files/ebd8f4de-78ff-48be-bb93-858fa73ef93a/what_does_civil_works_mean.pdf
    • https://s3.amazonaws.com/vunizi/baloo_normal_font.pdf
    • https://uploads.strikinglycdn.com/files/d1f229a8-279b-4740-877d-56a98f059274/linear_and_non_linear_text_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/cb028224-fd06-40ec-a39b-0297bf1af395/administracin_de_medicamentos_en_pediatra.pdf
    • https://s3.amazonaws.com/kovezux/amhran_na_bhfiann_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/9d9d2698-800c-4cdc-9446-6ce77bf7e8f4/kegutaruluw.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/tujuno.pdf
    • https://uploads.strikinglycdn.com/files/b607d4a7-2703-412f-8e3c-0f14cd7e7707/nimomavisopunavilatipu.pdf
    • https://s3.amazonaws.com/midaguvimabof/4312435024.pdf
    • https://s3.amazonaws.com/xonobijikivo/mi_store_apk_english_version.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010707.bin
ed27271c5aa3cbbfd2189b3a62f6deeab972909ba82e32c99110be062ea8a286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 5068 bytes
font_01_sfnt_off0001184c.bin
81e5fc886a605afe0a334ca6700baa62f8740fec675f16b7a22607f28e398873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10884 bytes
font_02_sfnt_off00013d75.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 4324 bytes

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