Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffee36f75fe5e54…

MALICIOUS

PDF

71.5 KB Created: 2021-04-02 12:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a883afb5df94e13812dcc245e9bbe1 SHA-1: b985370725a8e9412378673f6be9b5da7d24513b SHA-256: fffee36f75fe5e54a0d98f36a4a70e780a69fdb37433c65dca0604d57abac766
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a secondary payload or redirect the user to a phishing site. The document body, though partially corrupted, suggests a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=lucky+leprechaun+half+life+problems+worksheet+answers
    • http://uscovidcharts.com/guxikuzomubiparajomyt2fv.pdf
    • https://cdn-cms.f-static.net/uploads/4392218/normal_60602b8381aee.pdf
    • http://uscreditreport.info/c_primer_plus_stephen_prata_downloadj2g39.pdf
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fdeee71ab067.pdf
    • http://dusikazo.mypressonline.com/alzheimer_fisiopatologia_2020.pdf
    • http://lewuvumo.sportsontheweb.net/manage_personal_stress_in_the_workplace.pdf
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6026aac132bfc.pdf
    • http://posurazatux.mypressonline.com/derixaganakedemapejob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vapite/59660209601.pdf
    • https://uploads.strikinglycdn.com/files/ea49334f-6c20-44f7-9bf5-18ea3b1d2da8/2014_jeep_patriot_for_sale_by_owner.pdf
    • https://uploads.strikinglycdn.com/files/5ffc1345-4e1e-431e-a7ef-f69d5a472483/kenmore_90_series_gas_dryer_motor.pdf
    • http://kubomefewofumim.atwebpages.com/50878424911.pdf
    • http://tumobuwixakeg.atwebpages.com/bijapuwamezolisejaxuw.pdf
    • https://uploads.strikinglycdn.com/files/a2a19f03-a060-4412-b5c6-e2cf568cff53/how_to_calculate_shear_strain_rate.pdf
    • https://uploads.strikinglycdn.com/files/baff062f-c957-475a-a179-de5344ab5cb4/the_son_of_neptune_series.pdf
    • https://s3.amazonaws.com/mubefula/petsafe_wireless_dog_fence_setup.pdf
    • https://s3.amazonaws.com/gekixadonuru/zizijewumesato.pdf
    • https://uploads.strikinglycdn.com/files/67cae83a-9280-4f19-962b-e62f2841ad64/mazamer.pdf
    • https://s3.amazonaws.com/dabatisew/moburobibobet.pdf
    • https://s3.amazonaws.com/lanorolowu/atualizao_android_9_asus_zenfone_4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4d.bin
0c7ab3946a94fc09d5962037f99fb41952d6e3748d05e584cdb0f0396aafb534
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 5592 bytes
font_01_sfnt_off0000ed45.bin
4a60f46e9b490811711041a26e9a91199ec5bd8d08f6bbaf88e3eab0b78c5bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10456 bytes