Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c86ebbedd7f6cf…

MALICIOUS

PDF

89.0 KB Created: 2021-04-02 11:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2779880bc7bd2412661a4fc32120a814 SHA-1: e80aa5dbbe315cd50f003897de522471c28fab0b SHA-256: 56c86ebbedd7f6cfe905cd4311ad574b8f31b0de14347f3a69e8a8fd6f180263
166 Risk Score

Malware Insights

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

The PDF contains high-confidence heuristics indicating suspicious and invisible links to external domains, including one disguised as a PDF file. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

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://xajibur.ru/123?utm_term=linen+house+linen+sheets PDF link annotation
    • http://sochi2026.com/32062049978ds1xc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_60506fa56a7be.pdfIn PDF document text
    • http://loginwithfb.site/blindspot_hidden_biases_of_good_peoplei3xgd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_6047519b6557c.pdfIn PDF document text
    • http://siankaanmexico.com/you_are_the_universe_book_free_downloadnxcsp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5ffbf1b29badf.pdfIn PDF document text
    • http://rifivejawix.22web.org/67400188581.pdfIn PDF document text
    • http://jixusigelabewe.iblogger.org/how_to_set_call_forwarding_in_samsung_a30.pdfIn PDF document text
    • http://fadopaduwovod.iblogger.org/24329680521.pdfIn PDF document text
    • http://trickyturkey.com/xobogalavujakimopurunokdcb5h.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/giivBhc/18430175876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600b63ccc41bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_6038c42f9dddc.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/CiicDct/zisukamorozibufoxixuv.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/b3ad51e8-82c8-4845-98e5-3d5b322d06a1/a_dream_deferred_by_langston_hughes_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedb2a32-50ef-419e-a1e9-5964d369b6e9/how_to_print_wireless_hp_officejet_4500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3031216b-f144-4fa2-91e3-63b090e4d7ee/arctic_king_portable_air_conditioner_not_blowing_cold_air.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/sample_autopsy_report_gunshot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963fd074-d2fe-42bd-9977-b128de768e9e/calvinism_vs_arminianism_chart.pdfIn PDF document text
    • http://xelemebimatof.epizy.com/19351549267.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/flashcards_template_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/automatsko_upravljanje_knjiga.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/52567397779.pdfIn PDF document text
    • http://mivoxonewume.rf.gd/antnio_gramsci_livros.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_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 4408 bytes
SHA-256: a73f77af3c9eebc6d5350566461951bb1b5dbe7ce7b1868393751cef7f9c9224
font_01_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 11444 bytes
SHA-256: 488590ec13a412d86764b113877380d39e7cfb0761734bf9176cdbf4fc5d18e5