Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb580138499d665f…

MALICIOUS

PDF

74.3 KB Created: 2021-05-26 15:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bedd1ea915c9ed77b953ed78c6e2befc SHA-1: 89ca9f2dc0e1e1e8178680700f10fe8e9e4005a6 SHA-256: fb580138499d665f527a12743420493783833255f2e8680c4a0c38ac6ab14f83
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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=how+to+set+room+thermostat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601a7fc386d61.pdfIn PDF document text
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/wibanigu.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/550dca6653154.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/6416581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_60531072a1b93.pdfIn PDF document text
    • https://bigeriburaline.weebly.com/uploads/1/3/4/3/134334921/bonoxobiwupesapiker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdcddf8-e33d-4b7b-affa-07f8a818d596/john_deere_x320_mower_deck_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16ae63d-cb92-4835-9707-2db9a5ac55aa/wujifamibanajotolumojiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8296a5ef-2b47-4506-a5e3-9c1b19aca864/escape_from_alcatraz_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d158ce6-2e0b-4d2a-8474-cce6ba104745/miller_dynasty_350_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4253e00-000c-4a8d-938a-938188437973/who_owns_the_ice_house_chapter_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c30755-8dd1-4856-9e91-1b4cc7394f9a/overview_of_osi_reference_model_and_tcp_ip_protocol_suite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6661f384-620c-471c-ac29-cbf11b8e94e2/how_much_does_it_cost_to_rebuild_a_350_turbo_transmission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5f6069-ea59-4520-b99e-265d1b6b3984/zombie_graphing_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6ca03d-71b0-45fb-bc56-167da8ea208c/kekalazuruturejepuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d79bb0b-f8ee-4804-93e3-77112628b02d/93165621232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7bc0e7-a1a1-41d8-acdf-2bf5c7d679dc/exerccios_diagrama_de_fases_da_gua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685e7835-a636-413d-8e27-fbf56180ffc8/five_nights_at_freddys_3_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9112ec-3e39-410b-84d5-28027cd38199/4360836210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79f02d7-bd51-4ebc-a6a8-15835e7454c7/upgrade_android_box_4.4_2_to_5.1_lollipop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72d8868-6839-4a9f-94e3-1f72c6d8873d/ayn_rand_fountainhead_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d699fe4-02c9-46c6-a420-77306cc92b9b/how_long_do_i_leave_splat_bleach_on_my_hair.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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 4948 bytes
SHA-256: 392d728d27ff542f6d2cbfc63e9195f146c9415a3582fcc1b88ea3933d7384b7
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 10640 bytes
SHA-256: ccdeb0e01dfffbaabea1d619994bd0b07b3526797a556450824f43e63f621f20