Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e6b35d2cafdef6…

MALICIOUS

PDF

84.8 KB Created: 2021-04-02 03:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 06f6d4ab25f34a63bba121431151e925 SHA-1: 80f670a991816bd92f4805bb069a18f4d77d92a0 SHA-256: b1e6b35d2cafdef6229cb39778377d251e0ce22b79e0fbb1f9c067c17cfddebd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF structure and embedded URIs indicate an attempt to trick users into visiting these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=telugu+ringtones+all+movies PDF link annotation
    • http://jofarofuwudeveb.66ghz.com/dakewotukojiruzode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6030ac4a52ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473047/normal_6037c66169312.pdfIn PDF document text
    • http://gareduli.22web.org/pozalowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_605a388d46f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_6023ceb06b568.pdfIn PDF document text
    • http://gisomog.iblogger.org/faith_s_song_sheet_music_free.pdfIn PDF document text
    • http://tudilevu.22web.org/sogaramejefatijoguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_6054f99aa1202.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/dghtOkN/sliced_garlic_bread_recipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_6064a16703c37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_60111393da8b9.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/R8hjUv3/real_fast_followers_likes_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ginU1gd/point_slope_form_equation_calculator_with_two_points.pdfIn PDF document text
    • http://jakazobik.iblogger.org/catalyseur_voiture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kefebewo.rf.gd/charismatic_movement.pdfIn PDF document text
    • http://lexireto.epizy.com/62620724584.pdfIn PDF document text
    • http://fimuwixuxur.rf.gd/jeopardy_easy_questions_and_answers.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/10178205850.pdfIn PDF document text
    • http://bisobowezite.rf.gd/assassin_creed_identity_mod_apk_data.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/anglomaniacy_body_worksheet.pdfIn PDF document text
    • http://gokobuvutojo.epizy.com/el_seor_de_las_moscas_pelicula_completa_en_espaol_gratis.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/math_answer_8_2_2_2.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_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 5012 bytes
SHA-256: 78cc01f60a7e626413baa56a937647d44e47bc987ca75494ff7f8959c2903082
font_01_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 11484 bytes
SHA-256: 0b0a8edd56afb2d0f9e59b78f22bb756052910622722238abb53d1ca9c782069

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