Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e705b5b4b4b6b64…

MALICIOUS

PDF

68.9 KB Created: 2021-03-09 17:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 740de912b6eb3a798891ed17f378086f SHA-1: e27adf6127869348ce4d7ecf5291ebbe7292fd4f SHA-256: 0e705b5b4b4b6b64d4b31792e1b6de7026828bdcaa5bc039a124335d37bb2f3a
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and uses suspicious links to lure users to malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded links point towards a phishing attack that redirects to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/123?utm_term=formal+and+informal+language+worksheets+ks3
    • http://canlisohbetim.net/51194844447qh851.pdf
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/3603728.pdf
    • https://cdn.sqhk.co/famuxina/jbghjbx/the_eagles_greatest_hits_volume_2.pdf
    • https://fidenuta.weebly.com/uploads/1/3/1/4/131454859/fusegejoxa_zonufajidufoti_sataga_dabadidexoja.pdf
    • http://ritixibetono.mygamesonline.org/the_game_rapper_music.pdf
    • http://naturebiolog.fun/meade_114eq-dh4_battery_packqmkyr.pdf
    • http://securitycheckingbrowservkcom.xyz/cookbook_cover_template_free_downloadl3zw7.pdf
    • http://dirtygirl.fun/satoskar_pharmacology_free_download4hzw9.pdf
    • https://cdn.sqhk.co/dusaradezat/ibjbYhh/senior_citizen_phone_launcher_apk.pdf
    • http://openchambre.xyz/how_to_fix_gas_stove_top_igniter5yw6o.pdf
    • http://vbruti.site/kung_fu_panda_legends_of_awesomeness_season_1_cast2w1sg.pdf
    • http://lasleymarkt.ru/guc_english_test_with_answersekpob.pdf
    • https://zeziruxowajud.weebly.com/uploads/1/3/4/6/134698921/pesoxegukevigir-kuzemew.pdf
    • http://wijetaz.mypressonline.com/32332381345.pdf
    • https://cdn.sqhk.co/badaxiloru/cPhiiZh/oneplus_gallery_update_issue.pdf
    • https://cdn.sqhk.co/laxegipo/KTgjOnW/23623302287.pdf
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/takemux.pdf
    • https://cdn.sqhk.co/rosavuzezig/hcgcijI/1_32_slot_cars_for_sale_on_ebay.pdf
    • http://natural-shop.info/code_geass_imdb_parents_guide9f5k3.pdf
    • http://masalev.ru/how_to_set_up_jam_zero_chill_speakerde4po.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_a5fb678ed685482b88fc9b40601bc370.pdf?index=true
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_855d3d44ff704a5e8310694a8d9f28b7.pdf?index=true
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_58b9c5ab59ff45b1a059015f4fa533eb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6c.bin
7de694194d3fbd191bd88f3056e6eb5b5bc7c8eaea4c32fbde6942948c8d0e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 5596 bytes
font_01_sfnt_off0000e263.bin
a35fb63cadd31acfba5ddc2d278bbe4d82b35662d62c1ca7b0adad3afa82a66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 10360 bytes

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