Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55adb15e99d683a…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 17:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a2e84b0ca6a6394bb3e59acabd3986a5 SHA-1: 4ed72ecfa9f8ab97c617aa99c0b4cdd6e87c0364 SHA-256: a55adb15e99d683a8f558a7c8a67e50173055e5270d6843cd231940ad4329103
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or a distribution point for further malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'icebreaker questions'. No scripts were extracted, but the PDF structure and numerous external links are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=good+icebreaker+questions+for+high+school+students PDF link annotation
    • https://cdn.sqhk.co/zegodoxelob/jb6jdia/splashtop_wired_xdisplay.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/ew8jh7v/zevipapukuxemed.pdfIn PDF document text
    • http://sikutamilom.iblogger.org/kufuxelibenijolefikofo.pdfIn PDF document text
    • http://mukumirulaf.22web.org/sebavenapetopusetu.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/8hagfhd/alone_nature_images_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/jjERegh/downhill_mountain_bike_racing_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_87253a2b90804b448fc038c638624525.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/brain_waves_binaural_beats_apk.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_2f66814c9254479aa1dd249b7abf7b17.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_16fbb1f11c5e4887ba38ead9f8b4d5af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/bangla_movie_full_hd_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8eb3652-7de7-4911-98b7-ded7c2a44706/the_metamorphosis_kafka_franz.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_b3d3914665c94624aedc03e6f47dbfbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a3e8d5-8edb-42e7-8483-8cfcc1e62824/bayliner_element_16_owners_manual.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_3ecf748b47234d5797ec700a59385e97.pdf?index=trueIn PDF document text
    • http://medemamonolusav.rf.gd/brawl_stars_for_pc_without_emulator.pdfIn PDF document text
    • http://tumirukilifu.rf.gd/xuzabubezujometusebu.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/kuxaluwemixivapuputidu.pdfIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_5d49ae83ac464e64854a27c0399de3df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef500e54-82d4-455e-8dbd-3e9970df185d/bissell_big_green_machine_directions.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_1c5c858e74a348bbbed2c1b652db5ecc.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_a9ad8476ba6545f4be2c87d907d6c10f.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_dba378f7eb584357929f875a717b79b0.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_68fde3f796444dd1a913889ea3013797.pdf?index=trueIn 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_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 5644 bytes
SHA-256: 11a664c4452eb827c03911b7e0a4b95918aa7bddcfe9134f4a8d44f4cd3ec418
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 10372 bytes
SHA-256: 618d4702349df96e684ee6f44e81d3da793ec0d247d7f2d98eeb2ef7a87b1c3e

Open this report in the interactive analyzer, or submit your own file for analysis.