Malicious PDF — malware analysis report

Static analysis result for SHA-256 98674b7c865e921f…

MALICIOUS

PDF

88.6 KB Created: 2021-03-29 11:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8538941e47e62428e720d85faa85dea SHA-1: 5e4405906c67d87f0a25e18eb068d920eb01e565 SHA-256: 98674b7c865e921f8b12d127c473d514e7834e0fc14cdb13b325e77bd7403ed7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://crophysi.ru/award?keyword=certified+network+defender+study+guide+pdf+download PDF link annotation
    • https://cdn.sqhk.co/jasurisunav/cBijjam/star_trek_timelines_crew_stats_spreadsheet.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/eqrk1gh/call_of_battlefield_fps_mod_apk.pdfIn PDF document text
    • http://lolebunefa.iblogger.org/canape_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/hWUhhii/medical_assistant_jobs_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/gieZHTd/guided_meditation_for_stress_script.pdfIn PDF document text
    • http://xugafigipi.22web.org/zanunupow.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/b0GGthh/lol_zed_ll_stylish_runes.pdfIn PDF document text
    • http://firstsecu-paypal.com/canon_eos_utility_2_macqxp9u.pdfIn PDF document text
    • http://prequester.online/why_did_my_ice_cream_maker_stop_workingptwck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumaxokalabad.epizy.com/mipabap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec90d84-4270-4836-a1e5-18b09cdaa7c9/elm327_mini_bluetooth_driver_windows_10.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_62a63f80c4ac46c9b249a73c2c5bf3b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b7c55a-12a0-4d5c-b249-1ac4168c1ee9/how_to_connect_jabra_halo_smart_bluetooth_headset.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/lazarillo_de_tormes_adaptacion_vicens_vives.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_491aa8a506e54ec281c743cd8958da1b.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_68f6aeb3d5694ad980e1e047e7e92f86.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_e407d30b7fe644a6a5109c2805da6282.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/how_to_make_video_file_smaller_mac.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_953cd6deb8cf4e2a9abc0bfe20309b21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4605dc36-ce25-4614-962b-f393eaf825f4/can_google_voice_numbers_be_traced.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_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 5372 bytes
SHA-256: 8157bc70f304feb12a788de1a091bdc5a34805116d91129ba59bd5fbab1b60fb
font_01_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 12136 bytes
SHA-256: 6af7fa45ae24ea8bdadf170ac98c7eef79c93c2e757a2e7be0034fe9fece1d77