Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b71cd36c4ce9e5…

MALICIOUS

PDF

81.0 KB Created: 2021-03-27 16:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 952090359f484e2460bc0201fb4abcf3 SHA-1: b2d0f11815fd0782148dd2e284d90e12ff9bf937 SHA-256: d3b71cd36c4ce9e5e218d45440afc6ed7060ee163fa8fe1d76b497ca5ba6f89d
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a prominent one being https://nipisod.ru/award?keyword=ikea+catalogue+cuisine+pdf+2020, suggesting a lure to a malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent. ClamAV detection and ML classification strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=ikea+catalogue+cuisine+pdf+2020 PDF link annotation
    • http://jukojadijomefar.medianewsonline.com/types_of_gears_used_in_differential_gearbox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5ff956553a695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_60556fff7a46a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_6005f67a8a03a.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/lekex.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/95430532740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_60325b64b65b0.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/60868611143.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/introduction_to_criminal_law_notes.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/active_and_passive_voice_for_ssc_cgl.pdfIn PDF document text
    • http://waliduv.mypressonline.com/14318877266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_a1df9d3c577949c6a3cb30ab2c33ab4c.pdf?index=trueIn PDF document text
    • https://86cafecd-0af7-43e6-b578-14605c742a6c.filesusr.com/ugd/c4ddd0_71d761e9f6784cb78fc7472c6b8c3a9c.pdf?index=trueIn PDF document text
    • http://taguloxutenafol.myartsonline.com/aspectos_biologicos_y_psicologicos_de_la_sexualidad.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_10cde8b21e5f4b88af6765f3de2ba843.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be20d06b-0def-413f-a74a-fc9b85b4f426/38244213720.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_6f12f94b30a846ca8897a4262739f28a.pdf?index=trueIn PDF document text
    • http://samesesodore.onlinewebshop.net/why_is_my_router_internet_light_red.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_49f0c44d11874df0babc5f9945a97196.pdf?index=trueIn PDF document text
    • http://taberadajip.atwebpages.com/mack_e7_engine_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c0d612-bd92-4545-902a-cfa934700787/safety_first_car_seat_baby_factory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bd89e9-d2f5-4773-bca8-b143cbfb9344/54602189023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889f33a0-bf1b-483a-b661-6531468d9294/how_long_to_learn_final_cut_pro_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfc3f48-8868-486c-a9e0-904144b94c1b/how_to_put_shredder_on_cuisinart_food_processor.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/how_to_write_a_good_conclusion_for_persuasive_essay.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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 5500 bytes
SHA-256: 0c28105cc8e6fc153cf83b120c8baee3c4f440600ffedacb76c7fa2ee3bf3f7a
font_01_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 11588 bytes
SHA-256: 423ff414197ad26498b131743165a0e222a27ac38b8a3ea2283704d466b2a766