Malicious PDF — malware analysis report

Static analysis result for SHA-256 5394e10c5d91c17f…

MALICIOUS

PDF

82.7 KB Created: 2021-05-05 20:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5a0efcfb8a0b38e90f99a69d7d37091 SHA-1: 59e5eef94f0cab885ccac0bf038ebee6123bcc76 SHA-256: 5394e10c5d91c17f8025c86b03aec02e24d1d5599e795b376d23a5fe8cf1cefd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards the document's primary function being to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=dunkin+donuts+small+caramel+frozen+coffee+calories
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/7546584.pdf
    • http://load-bcp.com/lg_inverter_v_heat_pump_manualpkbf4.pdf
    • http://strapslap.online/padamexalirepavofemuwbixi5.pdf
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/larev_japorixe_vafobol.pdf
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/bobufejirakeguz.pdf
    • http://datab.vip/nakisesejexoritewolufiu2i2z.pdf
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/2f1a051ac009.pdf
    • http://hotita.space/free_printable_ladybug_coloring_sheets5wxnp.pdf
    • http://copyrighthelpcentral.com/cache_cleaning_apps_for_android8e35x.pdf
    • http://zibepifutidi.sportsontheweb.net/zewadojiwev.pdf
    • https://fuwowomazusora.weebly.com/uploads/1/3/4/0/134000162/1026504.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6a1987d-337c-4360-8a71-cb1a9170ed08/firex_120-107b_manual.pdf
    • https://uploads.strikinglycdn.com/files/e4406fc3-032a-48ce-a8ee-221c0f57c444/fiwifobopeguxilusujuvop.pdf
    • http://xobibaga.myartsonline.com/design_thinking_toolkit.pdf
    • https://uploads.strikinglycdn.com/files/734a7478-26e5-4b57-96d4-2b1f70cddc4d/bosomorel.pdf
    • https://uploads.strikinglycdn.com/files/bbffa718-1b9c-40bf-8e2a-e920c0b63dcb/nivujufafumowo.pdf
    • http://negumigimewote.onlinewebshop.net/burlingame_ks_grocery_store.pdf
    • https://uploads.strikinglycdn.com/files/f8979c0c-4861-446b-a4ed-2cd9b250b71e/kokevabivexibujaguwuwa.pdf
    • https://uploads.strikinglycdn.com/files/0a5d0b73-4b19-44c8-bc48-9a667b43bd1a/samsung_top_load_washer_error_codes_sc.pdf
    • https://uploads.strikinglycdn.com/files/9287d239-2853-4e4e-978b-ca4f371f953e/zafenofanopujenerugej.pdf
    • https://uploads.strikinglycdn.com/files/5325ac41-d38d-44ee-9ce5-6c5ec24c4ce5/68657248752.pdf
    • http://rotufixijisadi.onlinewebshop.net/contrato_de_arrendamiento_de_vivienda_mexico_legal.pdf
    • http://vegubom.atwebpages.com/gufarud.pdf
    • https://uploads.strikinglycdn.com/files/8290fa3b-8451-4825-8bf4-97aeda151af4/zojirushi_bread_machine_challah_recipe.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_off0001018d.bin
5b009ae25845f8ca7f9ef1aa7469f67492f9b232f6f2a4b55a22886c4a6bee98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 5280 bytes
font_01_sfnt_off00011378.bin
ef1828adaaa380ad82c311b38c6d91a7bf91d404d618777cad805fc007dee5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 12300 bytes

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