Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b69369568d549a9…

MALICIOUS

PDF

75.3 KB Created: 2021-01-29 20:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: dea73f73570be9976ab699c51fd874e7 SHA-1: 7e4373b62653eacd399c9a8fb11fa03b0ab5e7c8 SHA-256: 1b69369568d549a9f3a805e20cf9ce89ed95ab9f17ef35f9d874be1b3b87e28a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple disposable hosting domains. The embedded URL, https://maypoin.ru/123?utm_term=road+races+in+central+massachusetts, is likely part of this malicious infrastructure, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=road+races+in+central+massachusetts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367916/normal_5fce9b9337ddc.pdfIn PDF document text
    • http://verifiedbadges-form.com/funilomanirajededetotzdg.pdfIn PDF document text
    • http://hookup158.fun/dual_universe_beta_codea5fla.pdfIn PDF document text
    • https://cdn.sqhk.co/zezaxemepe/i8gfcha/sazutatamakifigulete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_5fe7904298897.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/ckBTieF/zephyr_stock_exchange_board_game_online.pdfIn PDF document text
    • http://phrensy.co/dometic_3_way_fridge_user_manualvkx40.pdfIn PDF document text
    • https://cdn.sqhk.co/fusatogis/NidibZp/slot_car_trainer_professional.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fee49206c69e.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/fuGpxWO/fedorutewil.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/dntjijj/can_desmos_graph_piecewise_functions.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/hm1jfgf/lucky_draw_tattoos_iii_marietta_ga.pdfIn PDF document text
    • http://reduslimitalia-official.website/39465502380zyevt.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/megujobemegor/chichewa_bible_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/47781749896.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_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 5188 bytes
SHA-256: 862ad1334e9d2cd5d83bf617cbfef28a40326033446ff840e99f4a74d709ae10
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 11204 bytes
SHA-256: c983e164c92bcc1b9455c5873d84083c10955cfdc02a9c24a907c7829b09610c

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