Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ba09dfd515370d…

MALICIOUS

PDF

70.2 KB Created: 2021-03-04 22:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 58ca436d7df9b15563d26cd68de48249 SHA-1: 41a7912f8860a2ddfe0a59665614475767faf8c6 SHA-256: d4ba09dfd515370d9198992bdf480d4a144e18c62fb1db092ab6539fbac6428e
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one pointing to 'zajinet.ru' and another to a disposable domain 'livofikozenaduj.rf.gd'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to a Dell laptop, suggesting a lure for a phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=dell+inspiron+3520+memory+upgrade PDF link annotation
    • http://xipevufizokev.iblogger.org/kegisovoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5ff3c44e341f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_600c886528346.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/how_to_brightness_vivofit_jr_3.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/toefl_ibt_vocabulary_flashcards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_600f939714623.pdfIn PDF document text
    • http://vesimawamom.66ghz.com/lewanewesaxazi.pdfIn PDF document text
    • http://solasaxutegi.iblogger.org/93106199436.pdfIn PDF document text
    • http://xofazonir.iblogger.org/que_cosmeticos_se_necesita_para_un_buen_maquillaje.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/93947993881.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/jaxuxaviwipejojimepozusow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livofikozenaduj.rf.gd/lol_patch_11.13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41eccfaf-fa26-4f16-ab21-b3fcc6fed7bf/how_does_the_firm_book_end.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/white_tiger_hindi_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b29037e-468b-4172-80fc-86b3f7b1cd72/how_to_pair_jbl_tws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dff835f-02db-4291-8a96-375b1f919dcf/wixavixeropunufoboz.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/moca_test_scoring.pdfIn PDF document text
    • http://mulusatore.rf.gd/android_sdk_location_not_contain_whitespace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3c8ac4-d0b3-4d77-a48d-1414889fb65a/onan_generator_parts_mesa_az.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcef4dc-00c0-40da-9b8e-de49cc43a797/what_statement_best_describes_the_theme_of_song_of_myself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cc0668-7489-4313-a180-bafed3e1c96e/kariga.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_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 5940 bytes
SHA-256: 3cd608006d3079926699600541d9698124b509343857f3a5f999ac1a7e6daa3d
font_01_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 10620 bytes
SHA-256: c5986808957be4f27da48826f68c0da437af117a6c43191b6b89db6a22f04e93

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