Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b28b842db15a5fa…

MALICIOUS

PDF

76.6 KB Created: 2021-06-02 00:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9385f3c9b00606d8fe0be60b3d3195dd SHA-1: 1ddfba9c02203ca3355c5ba794037169339d1e1a SHA-256: 1b28b842db15a5fa8ee7b009dc2c363bc8bbaddc6c406ad41d07d74d9927a237
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated and point to SEO-optimized content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wb?keyword=comparing%20and%20ordering%20fractions%20worksheet%20grade%206 PDF link annotation
    • https://vefujavud.weebly.com/uploads/1/3/4/8/134857174/4d4346e.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/3619322314cdd67.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/kugedewelezodune.pdfIn PDF document text
    • https://gemetubawu.weebly.com/uploads/1/3/7/4/137499391/b99d66e7c3.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/da8a3bbf56.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/52b83f21-25cc-4f16-bbba-fc70036edbcc/gokerixefasuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb14f65-bdd0-4755-8672-145022ca0ad9/is_outlander_a_good_book_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cabf907-cc80-430e-ac92-3c5dac7ede16/wadexujativudidabesesub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314fe114-94ef-4406-a00c-832fb0085e08/submitting_letter_to_the_board_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f900e576-f4d5-4bbb-b3f3-ded11cb1d2a5/throne_of_glass_tv_series_episode_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba47430-770d-4c03-a9f9-6de2eb6932fc/the_virgin_diet_breakfast_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149b3589-487d-4a09-bb5c-23bb732ddda9/bowflex_max_trainer_m7_fitness_test_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f6204d-4a98-45af-ad67-8e51b048805e/how_to_calculate_interest_on_a_revolving_line_of_credit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3902c3-5fff-44db-999a-8702b15d1072/td_bank_wire_transfer_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a64fbf-ddde-430d-bbb1-5ad63438339d/65402035230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2ac985-b3a0-46a9-930b-f4e3d977d9b0/how_to_grinch_stole_christmas_1966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1013651f-2ec5-4afd-9f93-271ba968ad41/napusiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d5668e-95fe-4794-9bf0-a3b816bfa5f3/vidoxexuvoderadegawoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39aab46d-ed44-4cd9-8eeb-629ced98c349/wixeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf682bc3-ea86-4157-9646-39175e1863dd/92414164344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c490b0-d628-434c-b0ae-90ed620db1ba/text_to_image_converter_app_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a72668-9aa2-459f-a4a5-9fc3586e2391/81163255145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32959275-daca-43ca-b55e-f0bf70c18e20/aperturas_de_ajedrez_para_nios_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efef832a-aa04-46a2-a1b5-0dc5f9510763/is_petroleum_engineering_a_good_career.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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 5752 bytes
SHA-256: f3cfd8709abefc26e81a4c0523be11fe0df4c61d30dbf4033229f60a6e40887d
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 11064 bytes
SHA-256: aaff986d13560be12341da191980eff76ae46a279145a99e8d8f07b3f0264f21