Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af27fab6619d415…

MALICIOUS

PDF

101.3 KB Created: 2021-03-13 23:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 87ae6963b10f8e82c49385444c051d2b SHA-1: ecb41b05df2909c516d1e1cb61ff08457df64893 SHA-256: 1af27fab6619d41507769ccb3ff190d867c6d376cc855d6aa7ed400c229d02b3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with the primary suspicious URL being https://kuzutuzo.ru/strik. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the structure indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=yn560+iii+and+yn560+iv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390371/normal_6021bb2eea5ec.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/rEieQgd/tap_adventure_hero_rpg_idle_monster_clickers.pdfIn PDF document text
    • http://puxomisolerejog.iblogger.org/91666648181.pdfIn PDF document text
    • https://cdn.sqhk.co/lokemoxire/jjgQjdC/color_rope_around_a_tree.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_60308bf0d1687.pdfIn PDF document text
    • http://dopenukivo.22web.org/android_offline_games_like_summertime_saga.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/Cojgic2/61874358749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fc90919c6d0e.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/zoxewudunigus/sap_customer_consignment_stock_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/31415317997.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/runitexorafunopakasexinin.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_80dc5850eedc4c04b68dcd27cf71eff5.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_02ba85513dd54a448ae7de395e78be0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/indian_tamil_movie_audio_songs.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_9f8556ee7a27415d8472e7d6852acea4.pdf?index=trueIn PDF document text
    • http://filopatoj.rf.gd/born_to_run_chords.pdfIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_f3ae5fba0cf54f479bc389b5ff261102.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_833d294c49574506ae3e21aeb895ab96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/apesar_de_voc_chico_buarque.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/senojokivovikukibif.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/harry_potter_universal_studios_orlando_wand_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/debt_collection_guidelines_qld.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/best_buy_corded_phone_answering_machine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFF 3140 bytes
SHA-256: 27a9564c4af3e08279c2a99be965fabb6293d964f7cafb7fed92762970ac1210
font_01_sfnt_off00014b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4A 5056 bytes
SHA-256: a45df8d85dcb114e5e31fb97640c537c2c59be1ca448ced8551b90447e73b829
font_02_sfnt_off00015ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA8 12400 bytes
SHA-256: 0d00385164f5f309f2259dedf475c1a1162ec9c26825137318d9f5780de5391b

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