Malicious PDF — malware analysis report

Static analysis result for SHA-256 2566ee8931ee75c1…

MALICIOUS

PDF

81.6 KB Created: 2021-04-22 15:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77ac255476ffbf0973d25b379fc188c1 SHA-1: d7949078c2e1ccdc7d2c91188fa4a4fab759097f SHA-256: 2566ee8931ee75c1a0358b298e13cfb45798077ac60bfb3bbc2967072cf4b40e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially harmful external sites. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=graco+nautilus+3+in+1+car+seat+remove+back PDF link annotation
    • https://cdn.sqhk.co/wixumenez/Tpjfiew/17507265012.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/iJlcghU/billie_eilish_net_worth_may_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/hhjge9Q/jojezolemotonevoxameso.pdfIn PDF document text
    • http://domavera.ru/lyrics_for_castle_on_the_hill_by_ed_sheeranee6ob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_605a67c448303.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/zudin.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/9pzihnu/template_of_promotion_letter.pdfIn PDF document text
    • http://m-ryanaf.site/larousse_gran_diccionario_espaol-ingls_english-spanish3huz3.pdfIn PDF document text
    • http://boothattendant.com/rivirerifaviwageluluvilufgdqm3.pdfIn PDF document text
    • http://baugroup.info/bellamy_brothers_full_album_freesgv6n.pdfIn PDF document text
    • http://fikebek.sportsontheweb.net/vafafuwaf.pdfIn PDF document text
    • http://kasyanbeauty.com/char_broil_performance_5_burner_manualdk2me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_605e0179b360d.pdfIn PDF document text
    • http://tublitalia.fun/vinogorimijodekelez3lndn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_60340aea7d2b9.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/zenujiwolodojisovofit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_6047ee468b12a.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/fe1e7d08-5579-411f-9a36-21b579de960f/tolirewutefuliruni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72e7e3c-12d6-4648-8d5a-102cf5f127dc/binary_trading_guide_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251c8602-1892-4448-8582-2f6b08511a15/maschine_mikro_mk3_ableton_live_10_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c96f3d-8d71-4dce-a3f2-c8206de05173/metuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5b0869-0d53-4e71-8301-35cf0889f203/nefajofirotesi.pdfIn PDF document text
    • http://kepewitibafef.myartsonline.com/coordinate_graphing_pictures_middle_school.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_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 5456 bytes
SHA-256: 01d724ec43607023e155df8162cb7f62bc1d890245ee4a62fe5cd4f528273be9
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 11268 bytes
SHA-256: 025199dcdf0fd006ae9f296ae84062605db44fdb72f11d9e05703ecd071cb4a9

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