Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f6a5209e322046…

MALICIOUS

PDF

102.8 KB Created: 2021-03-09 20:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c91fec8d78b6ebc8f2f7a4257086a629 SHA-1: 7417a32fe1e19b396c0eb888a37639f1fab4f94a SHA-256: 10f6a5209e3220463f3927387c2b831f6492c799c6776a2595d4ee8a1ba69b8c
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://soxebez.ru/123?utm_term=best+photo+editor+pc PDF link annotation
    • http://1xbet-registrat.site/perfect_ellen_hopkins_audiobookkovs9.pdfIn PDF document text
    • http://fabermanufacture.ru/my_cousin_rachel_reviews_rotten_tomatoeswmfuu.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/fusofagedigew.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/794bdb42df5fcbd.pdfIn PDF document text
    • http://bridgecommerce.com/cfi_trainer_test_answersmoj7k.pdfIn PDF document text
    • http://icub.tech/zonojorikapegixanuwuzosl6k.pdfIn PDF document text
    • http://reduslim-shop.website/laptop_factory_computer_builder_and_maker_gamesfedlb.pdfIn PDF document text
    • http://gachihyper.xyz/141660247132t55c.pdfIn PDF document text
    • http://jushq.pro/hayward_swimclear_cartridge_filter_manualjudqn.pdfIn PDF document text
    • http://wisitens.online/what_was_germany_like_in_the_early_1900s7lsty.pdfIn PDF document text
    • http://parrrtner.xyz/besivugubopubetovijosfjset.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/funny_answer_to_where_are_you_goingsxepl.pdfIn PDF document text
    • http://good-production9.site/16065832567pm6tb.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/9043bd50-8caa-4f42-860b-f42b5c4db38a/the_man_in_the_high_castle_season_2_episode_9_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b77bd2-cf20-47e9-b248-c899b02d6a45/37995904614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d203146c-056c-446d-96d5-99bad2047b21/kubixev.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_off000157cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CB 4968 bytes
SHA-256: 9adb634ff8e6da47e23d8147702e105a78a6eedb823c6e3c05eb704ab86c661a
font_01_sfnt_off000168ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AE 10868 bytes
SHA-256: e961dfb97adf6efb6eadc04fe54c5940eed348a621fc0bf802d858cda338820d

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