Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cd590b97b06130…

MALICIOUS

PDF

76.4 KB Created: 2021-03-04 14:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8b9abf1b07558eb21cec2e6edf0efde0 SHA-1: b757f6b5d81ce4b2028b8ddda0a0500eefc50598 SHA-256: 72cd590b97b06130f190fed8de07fd76998a9172a947aee3b9025ff156185ad0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document body, though partially obfuscated, contains text related to a 'little book of talent review' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+little+book+of+talent+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_601bad5d9f1be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5fe51394d94f2.pdfIn PDF document text
    • http://detonicinitalia.website/77913410018rzf8t.pdfIn PDF document text
    • http://carinsrates.com/australian_cancer_council_colonoscopy_guidelines82933.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/61737796535.pdfIn PDF document text
    • http://servisvds.ru/leaving_time_jodi_picoult_downloadn809z.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/nikomasiwoj.pdfIn PDF document text
    • http://zoompol.xyz/can_we_use_pointers_in_cfljhv.pdfIn PDF document text
    • http://bigmagazin.xyz/tusefagusebufogidamugokf46g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ff285732721c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://durunorutap.epizy.com/lupotuxusulaxivitibo.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/82852598783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5db042-721d-4f53-900c-7cdbd38d6b55/vevipazexenufaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/audio_song_er_app_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec695b59-4f87-4d38-8eb8-0505a8a034f3/87938528901.pdfIn PDF document text
    • http://tomunipi.rf.gd/6641517915.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/zuguveberibefum.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/off_road_bus_games.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/sutiwelunesazewuri.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/picture_story_english_worksheet.pdfIn PDF document text
    • http://fuvogixus.epizy.com/the_fall_of_constantinople_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26c8424-7db3-4410-a756-daa823440a37/how_to_make_my_dryer_stop_squeaking.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/vazuv.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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 4980 bytes
SHA-256: c0bbbcde2f00609ed49a6fd1c8277ccac09dc3eb3230e2a98096a679b796a564
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 11004 bytes
SHA-256: 04fd4e3858b99a49ceeca38b8768577cced5f893dd16ddfbb7434566a148c819