Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bab868af07983f…

MALICIOUS

PDF

76.7 KB Created: 2021-04-01 15:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 23b81cd3b78dd164be7ccde727d6d474 SHA-1: afc4897665849b40b1a6383e3f46779bfbaf3e06 SHA-256: 31bab868af07983ff6c3e52b203b6fdcd58b86f5031257cd3f204a99ddf1f11d
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one prominent URL pointing to a domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to medical terminology, likely to trick users into visiting the malicious site. No scripts were extracted, but the presence of external links and the overall heuristic profile strongly suggest a phishing or malware distribution attempt.

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://jumiwimov.ru/award?keyword=rangos+de+movilidad+articular+goniometria+pdf PDF link annotation
    • http://accueilcmb.com/1055323163173azv.pdfIn PDF document text
    • http://bullbananavannaone.xyz/lujezerudemokum72gp6.pdfIn PDF document text
    • http://gallery-shop.site/gosiderilosipoxowii9rfi.pdfIn PDF document text
    • http://fashion-deals.xyz/6252477977fvp9d.pdfIn PDF document text
    • http://vikiwamatibude.22web.org/govuzuvoxemanafijegegilab.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/schwing_stetter_batching_plant_m1.pdfIn PDF document text
    • http://you-bestshop.xyz/sogojapadawewizezuridaxcx9u2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41f3aca-ac6c-4a60-8ce1-ed1fc249ba8f/taco_bell_sodium_warning_deluxe_box.pdfIn PDF document text
    • http://xuvemotoguno.epizy.com/punuzumipusawupemixi.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/nulumiwusonurakebikamo.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_f65b69740b1040fd9ded8a027aeaafb3.pdf?index=trueIn PDF document text
    • http://lezipador.epizy.com/hernia_inguinal_recem_nascido.pdfIn PDF document text
    • https://a91f1da9-0b84-486d-9199-d95c2ecdf19f.filesusr.com/ugd/82421a_6fbf1e75502a482db66ee30e4c027b5f.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_24cff45650c940229c1664c70f641b14.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_5fe634abae264811ba45e71e5e71b3fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fdcd36-bb7e-4909-94be-22d508f14d04/origami_cat_bookmark_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478691cb-a424-4dbc-8565-42f38a8bb36e/gre_test_prep_online_course_princeton_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38db327-2a8e-4911-a02a-54ee6826bda5/31987729641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f367c86-c72e-4fa9-bdbe-b2dd0db00e42/jugajeligividux.pdfIn PDF document text
    • http://laxuraxosolun.epizy.com/aws_cloudformation_sample_templates_github.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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 5540 bytes
SHA-256: d57709d1b1ba80382d813cdc1c27a3674dffb44d2ff1591ff67e00750351b9f9
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 11084 bytes
SHA-256: 12c44331f000c48055be3ca14a6aefa643f8c52ef5cc1f57863dd49cba215877

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