Malicious PDF — malware analysis report

Static analysis result for SHA-256 b295e04ffd6e346d…

MALICIOUS

PDF

91.9 KB Created: 2021-03-10 10:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1d37cb1d56b51648c243a0e928bed5c4 SHA-1: 777fcc1111a4c1dad0a8400e1d33b134ec0e263a SHA-256: b295e04ffd6e346d4a99ae20cd1c3d280fe0671a5abc69c15f8f3ca985a7031d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm heuristic further supports its malicious intent. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=bonded+mind+pathfinder PDF link annotation
    • https://cdn.sqhk.co/kubafipefo/iegc5ia/download_game_snake_vs_block_mod_apk.pdfIn PDF document text
    • http://private-channel.site/flash_oyunlar_indirltm5a.pdfIn PDF document text
    • http://arendagg.xyz/nikon_coolpix_l310_specsl0zmo.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/hcid8u2/9844885741.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/hfghlaA/the_wolf_among_us_traduccion_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/dhfmgXL/the_cult_of_chucky_2.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/algebra_and_discrete_mathematics.pdfIn PDF document text
    • http://reduslim-eu.site/fexasupudetebirasebb4u.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/lenubajimo.pdfIn PDF document text
    • https://cdn.sqhk.co/xogeloke/hdhcbIq/93805017707.pdfIn PDF document text
    • https://cdn.sqhk.co/disemelukap/fbheijc/49832302430.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/13_derivatives_of_inverse_functions_homework_answersjt1ze.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/hb8Thhh/grocery_store_palm_desert_ca.pdfIn PDF document text
    • http://dsv-trening.ru/71112639512sqcwq.pdfIn PDF document text
    • http://secret-empire.ru/best_online_wing_chun_trainingvlzc5.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/iJhi8ja/radio_italia_news.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/nxHii5w/80235887397.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/65713704331.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/eOLTm6c/86893593178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojosotum.myartsonline.com/gre_quantitative_exam_sample.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_off00012d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D70 5120 bytes
SHA-256: f7a82b44e786b948bcff7dd04fae1f1f947f7f16fbfec8fd66cfd54ea658eb13
font_01_sfnt_off00013eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB1 10504 bytes
SHA-256: 47a298315028af5d50cb9a01a5fcd58e90c4f992828ec1ed67f9d7931d2efc06

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