Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6c4cfd3330e3c2…

MALICIOUS

PDF

75.3 KB Created: 2021-03-30 02:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d5c149bc6d0d4d338ac8de073709ac SHA-1: 5244ee4c77e9b64d113da100b7a51cae27c232bd SHA-256: ca6c4cfd3330e3c2f16b4891850adf74aa6d2265088c5812dfcd3bb7d8096c41
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to potentially malicious content, and the document body, though truncated, suggests a lure related to business plans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=free+poultry+business+plan+pdf
    • https://cdn.sqhk.co/zumedizojas/jbjfihc/extreme_car_driving_simulator_2015_hack_apk.pdf
    • https://cdn.sqhk.co/duwenaxiseve/cJjcibi/one_piece_treasure_cruise_discord_free_gems.pdf
    • http://bekokax.getenjoyment.net/abordagem_quantitativa_e_qualitativa.pdf
    • http://fejavodexata.getenjoyment.net/84100611406.pdf
    • http://tesugujinarijag.mywebcommunity.org/computer_hardware_course_in_sri_lanka.pdf
    • http://tonemisi.medianewsonline.com/types_of_government_graphic_organizer.pdf
    • https://cdn.sqhk.co/nuvurero/heheOfE/7062526640.pdf
    • http://tozemudezajif.mygamesonline.org/mcgraw_hill_my_math_grade_4_volume_1.pdf
    • http://koxivesuvif.mypressonline.com/olivier_blanchard_macroeconomics_global_edition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_0625a24467da4c68a8e815d0d348a7d7.pdf?index=true
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_d544913f991f41159a3e46dda305ac91.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2499a562-e27d-4cdf-88c4-124562183422/lenovo_thinkpad_t420_ssd_upgrade.pdf
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_5e636a6ae5b24efbacd5d7e47f9efeb1.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_9148ff1b71f74f9588e517b9d9468236.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2931ee6e-5bca-48ce-b974-659c6ad4d309/60621980399.pdf
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_40540544bae04c0f8f4d22ccd7191aba.pdf?index=true
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_f472e80d25f64b439f46661cbe913ac9.pdf?index=true
    • http://zesugipove.onlinewebshop.net/basic_excel_skills_test.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_827d92e810d5451f9d40eb697ae90cca.pdf?index=true
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_0e90aafdd2b84c99a065d50793917649.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d011a0be-336d-46aa-a5d2-cf76d2dfa580/honda_generator_parts_for_sale_near_me.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daae.bin
b245e2f4938e0df34c80ca0dd28b1131c2029c83998f23f2c78616cea6f1df01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 5116 bytes
font_01_sfnt_off0000ec1e.bin
efea0e514824b1491cc67d75f92fbbeee6f85d7fc751a721b44a09bfa64bffde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 11116 bytes
font_02_sfnt_off000111ff.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 4324 bytes

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