Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0529d23cf7ab8f…

MALICIOUS

PDF

71.4 KB Created: 2021-03-14 15:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f25b04db84dc252855311d1e52f88edc SHA-1: 75a716fb7e943a8c76ea699bd8f1def4d20ec320 SHA-256: 8d0529d23cf7ab8f9d5e11caefdf291fb6366dc686fc9554cc55de2535dd477c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains multiple external URIs, including one pointing to 'gimoguvi.ru' which is associated with a payment redirection lure. The document body, though heavily obfuscated, suggests a lure related to downloading software, potentially to trick users into executing a malicious payload. The presence of numerous disposable domains and link farms further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://gimoguvi.ru/wix?keyword=vysor+apk+download+uptodown PDF link annotation
    • http://kixurox.getenjoyment.net/best_ukulele_videos_for_beginners.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/cuales_son_los_pasos_a_seguir_en_el_proceso_de_investigacion_cientifica.pdfIn PDF document text
    • https://fusibeze.weebly.com/uploads/1/3/4/4/134434453/993ea16.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/how_do_you_share_a_video_on_facebook_story.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/how_do_you_put_songs_on_ipod_nano.pdfIn PDF document text
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/8034405.pdfIn PDF document text
    • https://fojomifurinu.weebly.com/uploads/1/3/1/3/131378835/duvokerofej_japefibavizinov_gonafetiga.pdfIn PDF document text
    • https://zududebagulakes.weebly.com/uploads/1/3/3/9/133997448/gidejilet.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/whats_the_fastest_way_to_learn_korean.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/remufuzu/93561549.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_6a503edda92a405ebcaa996954b06cdc.pdf?index=trueIn PDF document text
    • http://kofaxafogi.myartsonline.com/general_mathematics_101.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/katoridarododelitaraz.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_e651d4647c5348cea46275f1c155cea5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lulelepese/3575280002.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/what_to_take_after_english_101.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_c3f2e54f69b541b9885ba6967fc307ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/desonuwetoxofunet.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_7bbb01e4c2274b94bf40d30bb97805d4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 5176 bytes
SHA-256: 200f5ff7c7c309b35ce212676dca888654554080e8c17f26a2f677a87ab69683
font_01_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 13856 bytes
SHA-256: c194cbe0f670b9a952187ec4cd112833e72bdcc7b0cc43d81d898e28231ce4fd

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