Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a43c6c2563f7b2…

MALICIOUS

PDF

89.8 KB Created: 2021-03-17 04:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34f4edaf74d5e13332c1f9bbe3f198a6 SHA-1: 8f29b3e6f7335a65b8a0aced06da02d82394f378 SHA-256: 36a43c6c2563f7b22a9d66d534d4e67fc0dd120cd4d77ab15d4e8f125d31a1ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/123?utm_term=schengen+visa+application+form+germany+2018 PDF link annotation
    • http://playmarket-online.com/fisuzuvurofawejcxed.pdfIn PDF document text
    • http://opticsystem.website/slice_and_dice_data02jlh.pdfIn PDF document text
    • http://vash-komfort5.ru/67826012687fu8vy.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/kusegumozedezotume.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/3691188414.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/xuxipaluripuwipenafemuwuk.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/how_to_connect_epson_xp-310_to_laptop.pdfIn PDF document text
    • http://vidclips.design/pupovenuviwesujizixoruxuxfsnu3.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/filehippo_itunes_64_bit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6df8aeb-8564-4691-856e-7746cbe68c6e/how_to_set_up_cloud_storage.pdfIn PDF document text
    • http://xivoganunew.rf.gd/bang_bang_movie_mp4_songs.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_c197d232b6a44a00900ac389888e179b.pdf?index=trueIn PDF document text
    • http://sakigekoxigukil.epizy.com/62597427308.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/cigarette_daydreams_sheet_music_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d66868a-ebfe-4e2f-bbe7-c9ab6481b94b/gre_test_prep_online_free.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/xoxeburi.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/mivepowedu.pdfIn PDF document text
    • http://tumirukilifu.rf.gd/42007625206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0759c186-e3a5-49ed-a569-ac8fdaa483b4/dell_u2415_daisy_chain_not_working.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_a9fa2b9bb70b4236bf7017dbe76237ec.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_b3ce75b16d034f1d9c02882440a6fa89.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 6216 bytes
SHA-256: 08f4eac61212b0e54b2c7213342c524eefdb5d74da02ad492fb7cd9f42c5434e
font_01_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 11888 bytes
SHA-256: 365ada7918ec62937a626cbe7712cd92833bbc6c03f1bcbe26c07a9904390d6d
font_02_sfnt_off000144f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F4 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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