Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d497a68a7a845a0…

MALICIOUS

PDF

91.2 KB Created: 2021-03-19 10:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fa6cd9723410a80f0a199cd41753af91 SHA-1: 2012b4f0d426e0f028268a30bb6c1364a525184b SHA-256: 2d497a68a7a845a022c0efeff77eca10cef7e9d6cf6219195d8cc1937589e2d4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. This is strongly suggestive of a phishing or malware distribution attempt, as evidenced by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure itself is leveraged to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/123?utm_term=safety+data+sheet+binder+cover PDF link annotation
    • http://zexaribamemavi.sportsontheweb.net/johnny_appleseed_story_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/sif5A0z/guided_reading_activity_20-_2_world_history.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/gd9hjid/idle_breakout_hacked_import_code.pdfIn PDF document text
    • http://casser.xyz/what_happens_to_jace_and_clary_after_city_of_heavenly_firebz3z4.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoweva/hhhahiZ/gun_shooting_sound_ringtone_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/jcjbhb4/mufopazamepaburaferusiwik.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/13321156270.pdfIn PDF document text
    • http://indir-kazan.com/minecraft_2._0_download_20206ioq5.pdfIn PDF document text
    • http://fonabibexame.iblogger.org/83294689878.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/geDjfhf/the_new_york_times_presents_imdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muweluboxakok.rf.gd/samsung_j5_2017_aktualizacja_android_9.pdfIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_a2a28011b46b4625b7e1b73b7ab662f0.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_32cf3acdd66f46ed84152ab819df7633.pdf?index=trueIn PDF document text
    • http://juroluse.rf.gd/a_crystal_of_time_the_school_for_good_and_evil_book_5.pdfIn PDF document text
    • http://dinuwulorixipe.epizy.com/class_8_maths_ncert_book_chapter_3_solutions.pdfIn PDF document text
    • http://zimemotom.rf.gd/cell_diversity_compare_and_contrast_worksheet_answers.pdfIn PDF document text
    • http://sesunofopum.epizy.com/lamborghini_murcielago_manual.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/richard_lustig_learn_how_to_increase_your_chances_of_winning_the_lottery.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_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 5484 bytes
SHA-256: f87b91d41470f05e87cc87ea2db1e77175a46a8cc64211ba0482a82fc2ad1321
font_01_sfnt_off0001381c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381C 12048 bytes
SHA-256: 411fe6ca53e6a3aaf336e905d1e164fbe132033dd863d6a46dd708ed660e8f04

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