Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb03cb667c55b45…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 04:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f10cc5f1f99f761350665a0c85f43f88 SHA-1: 704def9a73822881bd53110d6a8b79d7d1850e07 SHA-256: acb03cb667c55b450242717061b84933d950dfeef5befa150661285081b1bc07
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/award?keyword=big+data+black+book+free+pdf+download
    • http://wisecreditscore.info/72260337843po64d.pdf
    • http://new-leggins.site/96316722613wwh1q.pdf
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/jotasamoto.pdf
    • http://feelslike35.com/risukotufosojilimujejawu5sdrt.pdf
    • http://tryplafond.xyz/109651533828ytci.pdf
    • https://cdn.sqhk.co/ribobujir/bFTmjhx/ny_rex_poki.pdf
    • https://cdn.sqhk.co/vadavenaw/icgjXP1/30310001474.pdf
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/sogironomi.pdf
    • https://cdn.sqhk.co/foxenikap/e2ghKie/nukapekit.pdf
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/2415561.pdf
    • https://cdn.sqhk.co/dajebala/bRjjgc5/danepolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/375cb09e-c312-4cba-b8db-c4a9aae64b87/tokyo_ghoul_re_is_kaneki_dead.pdf
    • https://uploads.strikinglycdn.com/files/c37d53a0-b12d-4e63-8fa5-c0b7354aa86a/24844506385.pdf
    • https://uploads.strikinglycdn.com/files/30b5b9aa-5a44-435c-ab19-9e9cb82f3700/behind_closed_doors_song_lyrics.pdf
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_0999f2e2c7bc4c249545a803782a3c45.pdf?index=true
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_efe42ed1bd4545108f7deaa741a17135.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f1d6ec00-5120-47e2-bd7b-e9c793f46cb7/how_to_draw_a_girl_posing_step_by_step.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_0cf27d3b2a334c7c8e561b6fd36a519c.pdf?index=true
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_e82f3c84b22e4e49a42c59233223258f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43f49ff6-e1cb-4b94-a0d7-3dc65f0d6b41/taco_bell_power_bowl_chicken_nutrition_facts.pdf
    • https://uploads.strikinglycdn.com/files/ad9dc6e8-6fd5-4a43-bcb8-10e2218e207a/jack_reacher_never_go_back_book_summary.pdf
    • https://uploads.strikinglycdn.com/files/96267d03-9044-40b9-bbf7-857046a48562/methods_of_data_collection_and_analysis_in_social_psychology_research.pdf
    • https://uploads.strikinglycdn.com/files/16c22eea-a095-4952-85cf-d6b8a8ffa88a/hp_deskjet_2132_print_scan_copy_software_free_download.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_off0000f016.bin
348995c25a81adec49ba8dd24117fc970ebec82f1352bdc24daa7bf58d8ef7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5276 bytes
font_01_sfnt_off00010220.bin
016c4479d53fe0f38040f76bef232e034e7f46e9d9d05e7381fe1e91459ae5bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 11700 bytes
font_02_sfnt_off00012a0d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 4324 bytes

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