Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3099b0ab349f488…

MALICIOUS

PDF

75.4 KB Created: 2021-03-22 19:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b91ba76e9542d9dd7e8ff93abda6f9c SHA-1: 757923b7542ba140b48e19927cb64c1e04eced8b SHA-256: a3099b0ab349f4884cf4787177ca8b79583cd8ccbdcba4927d3a2a6d7aacc668
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

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://kuzutuzo.ru/strik?utm_term=technivorm+moccamaster+kbt+741+replacement+parts
    • http://bit-ipo.ru/jonuxelabusoviwuiid34.pdf
    • http://zagejudivavi.sportsontheweb.net/18618797333.pdf
    • https://cdn.sqhk.co/lizupasepafu/KjiiaFs/70701049697.pdf
    • http://maxirem.mygamesonline.org/guess_the_logo_level_500.pdf
    • http://rikafitamedad.medianewsonline.com/angulos_complementarios_y_suplementarios_ejercicios.pdf
    • http://tuzupibu.scienceontheweb.net/suunto_ambit2_watch_band.pdf
    • http://widonatozeg.mypressonline.com/kufegitet.pdf
    • https://cdn.sqhk.co/vifejoneses/iLggneT/slither_dragon_mod_apk_download.pdf
    • https://cdn.sqhk.co/bujasugawo/eiiDXgf/clash_of_clans_base_th5_download.pdf
    • http://gukabibus.mygamesonline.org/pdf_to_word_online_free_ocr.pdf
    • https://cdn.sqhk.co/mitukutowum/hihchdo/79183706543.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/dorimitedikizatetenagogifkxfw8.pdf
    • http://dreamingdeveloper.com/what_is_my_ip_address_gateway_and_subnet_maskdd8md.pdf
    • http://sopisafexuj.sportsontheweb.net/how_long_to_assemble_power_wheels_dune_racer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_bba595a6bc0549c6879f93ec1243e665.pdf?index=true
    • https://s3.amazonaws.com/xeruxaxer/major_civil_rights_movement_events_chart_answers.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_c9317d81065c421eb219e312d315f3d2.pdf?index=true
    • https://s3.amazonaws.com/zunewidimem/19833381634.pdf
    • https://s3.amazonaws.com/bufexa/acc_heart_failure_guidelines_2016.pdf
    • https://s3.amazonaws.com/tawosutosuxi/tipos_de_sistemas_operativos_de_los_celulares.pdf
    • https://s3.amazonaws.com/xumakomowi/jetemelim.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_off0000dc03.bin
4a25b2e7943c183eef6ff54468b8d946b1a99badce1b4e17439a5c607f6134d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 5396 bytes
font_01_sfnt_off0000ee2d.bin
1e743af29bd68c0215971568c1f92afb7e8f9589b3bf1794d67a2d6f2a372fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 10412 bytes
font_02_sfnt_off000111d1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 4324 bytes

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