Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a793fbc3f05ea4…

MALICIOUS

PDF

75.6 KB Created: 2021-04-01 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6ac6b8158ecd0d6cb86103fb9784c35c SHA-1: 87206bf7e3e0d1a8cfa01ad6c5d2225d8d9380ff SHA-256: 87a793fbc3f05ea49186c7f25b632154598ab6e72f8b253b6f17b65527f3cb60
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://resalured.ru/wix?keyword=child+labor+laws+progressive+era+apush PDF link annotation
    • http://naturfresh.space/daytona_international_speedway_weather_saturdayjvsvv.pdfIn PDF document text
    • http://irisca.online/how_to_do_sentence_correction_in_english9wixs.pdfIn PDF document text
    • http://vizit.store/20922963660p52ds.pdfIn PDF document text
    • http://foyou.store/overlord_light_novel_volume_12_sub_indoykntn.pdfIn PDF document text
    • http://snail-case.store/myers_briggs_test_historyu7ci6.pdfIn PDF document text
    • http://teenagetutor.online/the_greatest_my_own_storyxqqcv.pdfIn PDF document text
    • http://wei-nmvc.com/what_kind_of_car_does_damon_salvatore_haveroi9z.pdfIn PDF document text
    • http://netewe9.xyz/b_v_ka_full_form6amyn.pdfIn PDF document text
    • http://workbykoder.xyz/79476459278k8l1a.pdfIn PDF document text
    • http://manybigs.space/sound_blaster_audigy_2_zs_platinum_manuale8rc5.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://55571.ru/how_to_answer_work_ethic_questioneowfa.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/97976609539655n9.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/93828042332m4cgl.pdfIn PDF document text
    • http://mrshadow.net/pocket_bike_pull_start_repairfkzxl.pdfIn PDF document text
    • http://it50off.pro/91850148439w6h9h.pdfIn PDF document text
    • http://openlait.pro/rogimavizdxov.pdfIn PDF document text
    • http://takipleskazan.org/how_to_connect_oontz_speaker_to_computertgnmx.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/xujitezu/jagetamaxezigugax.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/psychrometric_chart_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/brother_feeling_tamil_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046d9f3a-33aa-4b03-b466-16dd27725ebe/derosexaramazadovetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c62cd4-2c53-4cfb-998a-cc8ca6ffd754/is_sports_illustrated_now_a_monthly_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c1b4f1-1538-437a-b4f6-f68a4cfbf1c9/how_to_write_a_letter_to_remove_a_board_member.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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5420 bytes
SHA-256: eae78c04de3f9d8ad07c3fa03dfe719b98786804ce74707b4320f3941d6da7d3
font_01_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10332 bytes
SHA-256: 4698c98c040160cfd571621e70c0d2b97aa28d8d9cc4bdb0f103a74ca60b2941