Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec713346897b74f4…

MALICIOUS

PDF

74.9 KB Created: 2021-06-06 16:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 019a0d75dab0d6d44189fa6dd147ade8 SHA-1: 924f64264af84b57b953732a34520ad1bc8fc98c SHA-256: ec713346897b74f41cfd9b5031710e2431bc973d536088d7492503c584c9bd1d
126 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, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL being https://allytemp.ru/pbw?utm_term=left+colectomy+steps. The document body, though heavily obfuscated, suggests a lure related to medical information, likely to trick users into visiting the malicious link. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/pbw?utm_term=left+colectomy+steps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452845/normal_60294165d7f7c.pdfIn PDF document text
    • https://mabamakozipapap.weebly.com/uploads/1/3/4/3/134315796/4258458.pdfIn PDF document text
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/rifazite-zusejekaw-kasuzilotome-sobivegusukotud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5fee8ca80f357.pdfIn PDF document text
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/1284146.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392650/normal_60afe368d99b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60361ec72dda9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_601f7ff34aa3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finebov.pbworks.com/f/35401818231.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144618672/happily_ever_after_disney_sheet_music.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144425892/microsoft_visual_c_2015_redistributable_package_x64_windows_8.1.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/podakojumerurobogun.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/josuwaja.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144633885/acc_aha_blood_pressure_guidelines_2019.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144620370/72124549505.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144626277/pokemon_x_nds_rom_download_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d286d6b-9b9c-48f3-9628-768d2fc5f395/9422504401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34318d04-768b-4425-a9bc-81ce509701c9/mituzimunutofetozewonag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c889f161-f052-40f9-8aaf-a895233a5e02/sozogesolutovovipat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4d8343-216e-48f4-b61c-a0aa59e8ef2d/nuvuje.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144481119/manual_de_seguridad_y_salud_en_el_trabajo_per.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144523551/what_is_pokemon_revolution_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a30c92-4527-4189-ac26-b20be7d6cd5b/microsoft_word_for_mac_2011_catalina.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144622560/kebomugawerutup.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144587616/random_video_call_apps_free.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/caja_de_fusibles_jeep_liberty_2010.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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 4896 bytes
SHA-256: 61bb58f7f49c99df3d90974c08f224e588b3a84577e994cdee75a1005cf5c231
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10688 bytes
SHA-256: 8208fa8e808b1c2ef247a2c0d062728665ad8464cf043c817c027daf80ec0728