Malicious PDF — malware analysis report

Static analysis result for SHA-256 624232bec46268c8…

MALICIOUS

PDF

79.4 KB Created: 2021-05-06 01:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9257bc0b12cd15f9d8031155db697ae9 SHA-1: cdbeaa336466a302e1e38e8fb0091561280f66fb SHA-256: 624232bec46268c894ecfee2dfd1881bfe8413f16fc8d34e01061c3113fde223
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is https://maypoin.ru/strik?utm_term=que+significa+tomarse+una+foto+tumblr, which is likely used to redirect the user to a phishing or malware distribution site.

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
  • 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://maypoin.ru/strik?utm_term=que+significa+tomarse+una+foto+tumblr PDF link annotation
    • http://copyrightsupport-ig.com/funinaloduviletopezexm41tb.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/87124137141.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/evjejfp/bird_of_paradise_plant_pics.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/2017_lexus_gx_460_for_sale_near_me.pdfIn PDF document text
    • http://grenkasalo4.xyz/dell_optiplex_gx620_processor_listxkj80.pdfIn PDF document text
    • http://creditstar-kabinet.com/battery_for_casio_g_shock_ga_10002ghrt.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/6J7heic/spider_stickman_dismounting_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tetokimofomimiv.rf.gd/75902586812.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/implicaciones_de_las_inteligencias_multiples_en_la_educacion.pdfIn PDF document text
    • http://wafogaz.rf.gd/59585603710.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_a71e7040f1d84c5cbcf615e7dd7f6a84.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_96e93fafbed74f6fa08989f10a0f6751.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_ca4ff109a7894273a92d0c2bd201f355.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_bf12e92b237f40fc8fef9af51bdca646.pdf?index=trueIn PDF document text
    • http://ninivekav.rf.gd/37837082345.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_29ff45bd1ad845308de757ea10848517.pdf?index=trueIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_103af16273cb42e1b7604c77d316f296.pdf?index=trueIn 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_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 5400 bytes
SHA-256: 678920188293b3a28c052a9386ff5ab2e07b52b1774020839d0fe47c52981d51
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 2616 bytes
SHA-256: e15ef1734c38ac7d7ffea48dc12c9138c5548d1e2917bebb87517a0d41ce19c4
font_02_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 13388 bytes
SHA-256: 4b09294ae8d2dbffb80e72066329351317b123a66fbf85acc17fc89bb9e47185

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