Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a4d5b63adab066…

MALICIOUS

PDF

75.0 KB Created: 2021-04-03 17:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f91aa2385dbb7f7bc2352dddd8182ab2 SHA-1: 28726187d7c28437981717d45bda4abbd7449391 SHA-256: 74a4d5b63adab066331ca6d18cde23b50866a10263907b01f0d45e6187c15fae
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to suspicious or disposable domains. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

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://jottigo.ru/award?keyword=bayesian+nonparametric+data+analysis+pdf PDF link annotation
    • https://cdn.sqhk.co/poturofivat/djgijgd/choppa_right_beneath_me_playboi_carti_mp3.pdfIn PDF document text
    • http://vwwv-avito.online/miya_bhai_hyderabadi_song_ringtone_pagalworld5f84l.pdfIn PDF document text
    • http://bitjoms.xyz/70148486259t8szs.pdfIn PDF document text
    • http://repochka.site/all_star_wars_books_in_chronological_orderm65nr.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/i_wanna_iguana_persuasive_writing_lesson_plan.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/adding_and_subtracting_rational_expressions_quiz.pdfIn PDF document text
    • http://wonnaturila.space/wotuvokanuzugy63r5.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/hjUhg9j/20310164590.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/what_are_the_different_ranks_in_cub_scoutse153h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_998478ece4c545baa1b37faf095e1d1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusone/barron_s_gre_vocabulary_book.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_5ad98f04708143189b4b0be6f75e748b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/29032278966.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/82863706345.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/sap_basis_transaction_codes_definition.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_9ed480e95dfc4a85a8e1b781359933b2.pdf?index=trueIn PDF document text
    • http://vawofirulev.myartsonline.com/16601892542.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_8d52c22dc43d4a07a6114ca616c34bbb.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_9c52132d2bf443e1ab30f1c0abad758e.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_034d4cab71734ac89f2c62e96caad5c2.pdf?index=trueIn PDF document text
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_fc7e164ec71747cb983c9237a4442a7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/95801093524.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_234aec3eb1714077af643e80c3bb7111.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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 5452 bytes
SHA-256: bea9df161855396e5bf3482a2cb2de682cd07ad42c1fd650701374cc739b6465
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10696 bytes
SHA-256: 96e9a590bd46950febcd587ee4cd5ccc0539faad0e675b2016e68d7773575224