Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9a9fc393dda8b4…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 14:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e135e5bda3e2857d062fed25d620f412 SHA-1: 1e8586906d6dabf7f552380ca69be6c20172e450 SHA-256: 8b9a9fc393dda8b4773084beddf78166c9a70fea1b01ccbce89cf5eb3484966a
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, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and are presented as links to technical documents, suggesting a lure to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://vilenefex.ru/award?keyword=variable+frequency+drive+circuit+diagram+pdf PDF link annotation
    • http://zoom-omsk.ru/masters_in_business_administration_jobs_salaryaifx7.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/zewotava.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/vanguard_advisor_alpha.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/romeo_and_juliet_act_3_scene_1_exam_question.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/cannes_france_map.pdfIn PDF document text
    • http://car-test.pro/color_a_course_in_mastering_the_art_of_mixing_colors_by_betty_edwards8981t.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/scientific_management_in_educational_administration.pdfIn PDF document text
    • http://keysecret.ru/54144827821104a9.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/zabofupusipipezige.pdfIn PDF document text
    • http://net-klientov.ru/nagdev_bhojpuri_movie_mkvtrac6.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/hplc_agilent_technologies.pdfIn PDF document text
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/7f427b0db6d4956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarutufasiko.atwebpages.com/gumadare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d0c67e-59c6-4802-a08b-de22a32665a3/46642801643.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_ab21a6c6a6a746049e41dbed9d2a6023.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_638660f4d5e94dc6af091706a9a50cd8.pdf?index=trueIn PDF document text
    • http://fadudenomo.onlinewebshop.net/what_is_the_meaning_of_a_narrative_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f20bfb-21b8-409f-a32f-42b06fd7c7b0/datelawatikawenoda.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_d00f83e8f19d443c9e06be77cc7cac6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ddaae4-2d3a-495f-ada7-0f4ac981cbd2/6184639905.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_7e17c58de34c42ba983cf67f1009200d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7343ee-8e26-467a-9f8c-fa252e010d6f/dewalt_18v_to_20v_battery_adaptor.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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 5688 bytes
SHA-256: ad92200f4e4210c1ecc5351274b369fc32eb434f1e169e2453789b9039cf6e45
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10820 bytes
SHA-256: 4ad0bd68286dd3bb800f06308354e7a21f00c35291dfd86b3890aba85436586b