Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d4409b7525f09c…

MALICIOUS

PDF

99.2 KB Created: 2021-03-24 11:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fd0291ce3508259050e1917983d580a0 SHA-1: d5884597553541e16aedb1dab1b42947f2dd95b0 SHA-256: 50d4409b7525f09cc6da488a24b3ce2ef88b7a4abb67cca7fe93e80758cb98da
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is flagged as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to malicious sites designed to exploit users, potentially through social engineering tactics related to academic materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=thomas+calculus+instructor%2527s+solutions+manual PDF link annotation
    • http://bofesota.66ghz.com/cambridge_guided_bus_cycle_path_map.pdfIn PDF document text
    • http://ninujovapazolo.iblogger.org/speaking_in_tongues_scriptures.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/tisimodaxewubisu.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/thin_layer_chromatography_spinach_lab_report.pdfIn PDF document text
    • http://duboxol.iblogger.org/sujetalinotuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/92981012021.pdfIn PDF document text
    • http://nobebinexogiris.iblogger.org/small_merge_page.pdfIn PDF document text
    • http://robuzavobesav.iblogger.org/focusrite_scarlett_2i2_2nd_gen_price_in_pakistan.pdfIn PDF document text
    • http://sobofikikovir.22web.org/49792481386.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://vabanenutulaki.rf.gd/memifatotazatudafuko.pdfIn PDF document text
    • http://zizumanoxiv.epizy.com/61167349177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b97fb55-a278-4ecd-b948-25fac2e2e30d/wutugerajevomoniwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cb47c5-61ca-4e63-b067-3b2d999556cb/how_to_change_the_battery_in_a_g_shock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7d9680-1d92-4653-b097-c12fbd35d817/bbt_bank_address_near_me.pdfIn PDF document text
    • http://valebuwevunav.epizy.com/kali_linux_hacking_tools_tutorial.pdfIn PDF document text
    • http://zodejudefafu.epizy.com/redutedezutazijikenukabeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15edb11-e01a-4731-a51a-c086c002a91c/wejavivalevadopenatadop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1edccda-b947-4bac-9e70-84069dd9d556/nanujebixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86d7421-4b26-4393-bf18-1e5a858935c8/software_testing_course_training_in_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58479e6-5fb7-45e0-96ac-6bc81ab1e897/badger_5_garbage_disposal_1_2_hp_insinkerator_badger_5_with_cord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2437c1f-affa-4a51-967a-8621912e1039/kavura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae85b586-cccf-4502-ba7f-99f4ff9ebdb4/which_kindle_fire_has_the_longest_battery_life.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 9300 bytes
SHA-256: 5ef95b483be75de1943e121a5202ee75aaf563c8a79234800e43c74fcf00cd24
font_01_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 5024 bytes
SHA-256: 10edacc96067f54ddaa15ae6e71d78f73a68bb7831eefa11e9a97efa2109ab97
font_02_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 8976 bytes
SHA-256: 043275fd08f61a242a3987e2d5cd46ead7ad3b0856b8812769e4fb4fd1355f22
font_03_sfnt_off00015549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15549 11312 bytes
SHA-256: a602cae46a469949918970bd10a40174a85a16dd567cb2fe3166383a0c275511

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