Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5e39471b27c7be…

MALICIOUS

PDF

76.2 KB Created: 2021-03-07 17:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66b977885d79bbf19783a727ad74d2bd SHA-1: 844ae3b947b2172c1965b340e05a304a859664f6 SHA-256: 2e5e39471b27c7becbdee3cfebdfe46b0fc3899d96f69144cfb2ada3c7974ff1
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 are SEO-optimized and point to other PDF files, suggesting a link farm or redirection mechanism. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=russell+hobbs+breadman+pro+manual
    • https://cdn.sqhk.co/zanuvajebodu/fjhwshc/wallpaper_pokemon_wallpaper_hd_4k_ultra.pdf
    • https://cdn-cms.f-static.net/uploads/4485714/normal_60403d9cd4b7c.pdf
    • https://cdn-cms.f-static.net/uploads/4385014/normal_6030216486bb2.pdf
    • https://cdn.sqhk.co/pigajifaw/jaZijb7/79158105140.pdf
    • https://cdn-cms.f-static.net/uploads/4402712/normal_60367f0bc4df0.pdf
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600dc6a630de2.pdf
    • https://cdn.sqhk.co/mopomotop/harggOC/monster_trucks_movie_toys.pdf
    • https://xuvifadeto.weebly.com/uploads/1/3/2/6/132682806/penunexopizawejim.pdf
    • https://wakukorukizine.weebly.com/uploads/1/3/2/7/132712206/dfb841f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xuzed/22817858697.pdf
    • https://s3.amazonaws.com/dowavelaxam/los_verbos_irregulares_en_espaol_ejercicios.pdf
    • https://uploads.strikinglycdn.com/files/ee6f5db4-b60b-4009-9c91-ba962f7a5d0b/rejog.pdf
    • https://s3.amazonaws.com/dudujopixejikug/7882173586.pdf
    • https://uploads.strikinglycdn.com/files/de755681-811c-4d4e-a65b-f436279f144d/how_to_turn_on_hp_pavilion_laptop.pdf
    • https://s3.amazonaws.com/sixolose/ejercicios_de_ecuaciones_de_primer_grado_con_2_incognitas_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/8a264828-5e2a-42d8-b262-cf616df3473e/12146997007.pdf
    • https://s3.amazonaws.com/kakef/how_to_make_italic_font_android.pdf
    • https://uploads.strikinglycdn.com/files/4975f98e-3310-4c46-8bc0-bc392a686554/how_to_find_probability_in_statistics_statcrunch.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_off0000ed9f.bin
dc3d9c7a158c0c6aa1cc06e75a51163661113641d76939448715098a7ec99ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 5344 bytes
font_01_sfnt_off0000ff9a.bin
d1283a0e0a7959c67c0e9106ff27339746d398799fd34ed0eabdc07a1b6328ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 10528 bytes

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