Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39918d5212961cf…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 23:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ae51d79353fcf92583317de99ffcbb6c SHA-1: 1899fad3bdbd1d4e4faecbf4bab78ddab70a49ff SHA-256: e39918d5212961cf853f056a7e251267b7c81a1d1fafa86e41461e94da61118b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting and potentially malicious domains like soxebez.ru. Heuristics indicate a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://soxebez.ru/wix?keyword=wv+skillsusa+competition+2020 PDF link annotation
    • http://raisinshub.club/983786106967t8zi.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/AwAjejb/tower_defense_simulator_cowboy_or_minigunner.pdfIn PDF document text
    • http://redita.fun/scribble_effect_after_effects_templatejhqlx.pdfIn PDF document text
    • https://watubozez.weebly.com/uploads/1/3/5/3/135346011/dabigede_voripap.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/WPs2Hmd/50911635183.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/wejibilerafup.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/jjiUUhf/muwixidafiroxa.pdfIn PDF document text
    • https://fatofexar.weebly.com/uploads/1/3/4/6/134687548/tasozid-lodatumosase-mebelonako-wadodije.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/chfggjg/youtube_360_videos_playstation_vr.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/48921535bace40.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/ierjjxU/hockey_mask_halloween_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ce0fc01d-636b-4e79-b86d-34729c92616e/how_to_make_online_trivia_fun.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_a2551b9a2d374aa2824148fddfb76d4a.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_74881a19043c47dab7709eaa4e7af60e.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_56a0a5e933394aaaac838f1a0b1e70d8.pdf?index=trueIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_bed43f6b040d474bbe9cf5de5025bf49.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_f1d1b34b510a4a17afceda33978a1b47.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_c395a592a36342268f8879c396f26477.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c4209b-2a0c-4b62-a8d1-3c3e6ae6450b/ft-857_lcd_repair.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_51a7fa24538a41ab9640cc9cd48da542.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a509f202-cffc-4b56-b17a-c5f26f3628ef/batavofakodikewotavazodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52a8173-0715-4825-8aa6-ebfc4397eb20/libro_ingls_bsico_daniel_welsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17f4838-6fbe-4893-8f6f-9ec7ebb5a0ca/90778353322.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_4673da9c80e74562a38a446e9782f26d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5276 bytes
SHA-256: 8461583addda8fdbc7e011b9e3ed39060f95703916c1c7ceb5dff030c982f959
font_01_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 11176 bytes
SHA-256: a3d9a56a93c5d99afe111cde410f90ced850297300cef8f7981147527b58ecd0
font_02_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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