Malicious PDF — malware analysis report

Static analysis result for SHA-256 13270e683056d10a…

MALICIOUS

PDF

90.3 KB Created: 2021-03-29 00:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fc9aa315f90ea0b6b675fcdcf204b0dc SHA-1: 2226ab04dde09eed04022c440b9499dc66423814 SHA-256: 13270e683056d10afb1ea2aad94533a5fee03757dcfde7053fb3f245dd0ec69a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one that appears to be a lure for "Fursona ref sheet blank" content. The presence of a link farm on disposable hosting suggests an attempt to obscure the ultimate destination of the user, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=fursona+ref+sheet+blank PDF link annotation
    • https://cdn.sqhk.co/bovokolel/YIjicr8/500_words_bronze_winners_2019.pdfIn PDF document text
    • http://fsbsiod.com/dungeons__dragons_core_rulebooks_gift_set_special_foil_covers_editionsmubt.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/OsjahdF/diy_cat_warming_house.pdfIn PDF document text
    • http://instapriz.site/91877534162uhlq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_0f1d1bfdb824482da5e10f303e3601d5.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_050327f826054e79beded159da931e88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d4f4e9-7efb-442c-ad0a-4383c23e7f00/hard_spelling_bee_words_for_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647cbc11-955b-498b-bbeb-83d16cd3d32f/veg_paleo_diet_food_list_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/bivarofusuxasijedurulugid.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_8f4f8188cee049688a726dfea15d10de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13d86da-be13-4ae8-aee2-b34f34fa3f9f/fundamentals_of_heat_and_mass_transfer_bergman_7th_edition.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_c970b3f93f644f2c928085526663f282.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/keratina_sin_formol.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_a2447c1f1bc2459384be5bd456c22694.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/how_to_update_my_bushnell_neo_xs.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/annotated_bibliography_mla_format_purdue.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/kalender_2021_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da053f45-156d-4f7c-896a-b85a05b7b518/sokofokimataka.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_21fe69f486724ed5a1251c8ea781cce7.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f68fb4db7690489f95d74c146ba904c8.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_9dacf25bc7f04e0db0da74a02661bda1.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 5016 bytes
SHA-256: 09f7f85b2b0bddf7985bd6478619f93eaa6a36f5d7c145ec862bc3de11d80cce
font_01_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 11964 bytes
SHA-256: 74ff62b71c66926675f193f44525710a44188c3223932b2d9d9cff34f094b769
font_02_sfnt_off00014633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14633 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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