Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbe19be5b346dc4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-01 02:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5640bb1ef15c31434e5ff6b682f90adc SHA-1: 974a9f1f54aa7292069e66163c171d4b58eeaac6 SHA-256: 5fbe19be5b346dc4e621023c613aff68ae0dfe0db9deaf03fc832d7ada9c7ca7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying links to known malicious redirectors and disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the primary attack pattern involves directing users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=can%2527t+ask+don%2527t+need+won%2527t+acknowledge In PDF document text
    • http://nufarelarapo.iblogger.org/baby_doll_uma_new_song.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/TbYEgEL/cross_stitching_fabric_crossword_clue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5ffe6fe1d9190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461234/normal_5fc6ad206b314.pdfIn PDF document text
    • http://hookup158.fun/how_to_check_awa_score_gren20hh.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/6EhdTP9/smith_s_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_601730076c935.pdfIn PDF document text
    • http://visionnew.xyz/cartel_de_santa_vato_sencillo_cloroformo_letrariv3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fc826247fa45.pdfIn PDF document text
    • http://youralteragoods.com/bath_salts_recipeq29pt.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/aid3M54/xbox_series_x_best_buy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fcbbc3e6557f.pdfIn PDF document text
    • http://afracheat5.xyz/31103561894zpxcc.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/gcPXovt/name_the_eight_planets_of_our_solar_system.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/2012_maserati_granturismo_mc_specs.pdfIn PDF document text
    • http://tuzivapevof.epizy.com/sentinel_2_data.pdfIn PDF document text
    • http://xovijoj.epizy.com/steven_curtis_chapman_cinderella_piano_sheet_music.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 5108 bytes
SHA-256: dd2050610bb267440ca2a24a12dac8e94b2e35af69f398547f39b84bbe6481e2
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 11872 bytes
SHA-256: c858dc0e4e044c9381e622cfb24e78e6236521ca5637d3181fa0bdbd5e7aca72

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