Malicious PDF — malware analysis report

Static analysis result for SHA-256 9400b650a5f520dd…

MALICIOUS

PDF

79.4 KB Created: 2021-02-27 02:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c42dbe2c0699fe18d9ebbfe6c425e4ba SHA-1: 44070d269d49dd298868038f639e0550801d05c1 SHA-256: 9400b650a5f520ddd8f3426debc981bfd3d33af3654d79754225610741197a90
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to air conditioner manufacturers, directing users to a suspicious URL. The presence of external URIs and the link farm heuristic suggest an attempt to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=who+makes+evcon+air+conditioners PDF link annotation
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/sofejuw_jirovanilado_guraviga_tazefipo.pdfIn PDF document text
    • http://net-klientov.ru/33466730201x9iwf.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/33083140939.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/should_uniforms_be_compulsory_in_schools_essay.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/paxegenufirenem-levedew.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/how_to_build_a_website_from_scratch_wordpress.pdfIn PDF document text
    • http://site-shop.xyz/how_to_fix_my_maytag_centennial_dryerzhves.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/surface_area_and_volume_of_prisms_worksheet_with_answers.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/korg_kaossilator_pro_manual_espaol.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/mofoledolodi.pdfIn PDF document text
    • http://latencfsrt.space/68170072923w3mw0.pdfIn PDF document text
    • http://topsale.pro/how_does_hydrogen_peroxide_help_mouth_soresaiufw.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/binh_php_tn_t_v_36_mu_k_tp_10.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/louisville_slugger_black_flame_pitching_machine_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavamikilav.myartsonline.com/quran_online_learning_free.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/porque_estudiar_administracion_de_empresas_yahoo.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/jurewebafuri.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/c_language_while_loop_multiple_conditions.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_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 5284 bytes
SHA-256: 8bb50da9fa336fac14f71d46c4ff2fa0e8df3246754c71d4690e5b7252507f75
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10904 bytes
SHA-256: 2dae659adef4569d5387c20659ca82961911a0ac09b6c23f661e1f4acabce3c2

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