Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1291502b16ebac4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-21 07:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a518f3411c2e7b797fc42d2a7194092 SHA-1: b09b47724bd07eae6ef28bb2c3bcdaf3e734cff0 SHA-256: f1291502b16ebac46681ac817174f4df3d7add16cb04afe0c3344c72e446c145
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that likely lead to phishing pages or malware downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting. No scripts were extracted, but the presence of multiple suspicious URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=what+are+variables+in+social+research PDF link annotation
    • https://cdn.sqhk.co/gefimiwotux/jdFhjgZ/business_powerpoint_presentation_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_5fd118e19a9bb.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/tifotojujiwezuf.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/90708257085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_602b4d6448d06.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/jbEBljg/34627105778.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/Rjcgiha/46167374211.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/JHVjbif/diguxalezajawiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/9wmBGhI/sanonurawepilenufe.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/what_do_salt_lick_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/14Bl9gi/4_in_a_row_multiplication_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/S4Mgdii/63150191375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_60295b941d6ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5ff171660e519.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/dabogepafekumusime.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/ehaiaja/cafe_racer_seat_cowl.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/41aca3e9-60e0-496d-a2a5-3cb77376c229/black_and_decker_lids_off_automatic_jar_opener_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8dcbeb-a64b-498a-a9a3-0c0b4baf3278/behringer_xenyx_x2222usb_mixer_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0df7f70-be99-4326-a369-aab5e883e911/wasonesifudenuxasone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05205d4-424b-4c5e-bbe5-26eeda103f66/how_to_use_canon_eos_rebel_xti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7047addd-f37b-49c3-bdd1-d944077f7ad5/breakfast_at_tiffanys_online_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be62a70b-4041-4a0f-ace6-f0b15edfc13b/pencil_sketches_easy_and_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db06ade4-f04b-4d38-8e02-52a7c3b71f7a/formato_de_mantenimiento_preventivo_y_correctivo_de_aires_acondicionados.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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5100 bytes
SHA-256: 78ae774528b54f997545c3e1fd28d2dc546d65fe90ec4cc4101f9b8296d5ab9b
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10704 bytes
SHA-256: a8f01aa66040faf85de9d4523ef0b67ded9e293e98109eb043e236f8c20ed676