Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e411056f14d4a7…

MALICIOUS

PDF

72.0 KB Created: 2021-03-23 01:14:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e7f0fa7f6eaaa17be0a446620171fb66 SHA-1: 27c57c6b2d2c552a062f7cb69e6a8e3a321b7c93 SHA-256: 12e411056f14d4a7c5f836d9ac4052b9c23bbb39ecbe50de904fff972fe38de9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/award?keyword=dynamic+array+c+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5fe2160be70b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_603a06c8962e6.pdfIn PDF document text
    • http://pavuzebeveju.22web.org/black_and_decker_smart_battery_charger_manual.pdfIn PDF document text
    • http://zowirifukotam.iblogger.org/yann_tiersen_comptine_dun_autre_t_guitar_tab.pdfIn PDF document text
    • http://tevfikyuce.xyz/fiche_de_conjugaisongio9o.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/wezofe.pdfIn PDF document text
    • http://nedosako.iblogger.org/how_long_to_cook_ribeye_steak_on_george_foreman_grill.pdfIn PDF document text
    • http://ita-bio.space/delepobexosofirutoziwokjswl.pdfIn PDF document text
    • http://modernstyle.pro/ters_orant_rneklerieee5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_6039543e302e5.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/does_fender_fuse_still_work.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/will_there_be_a_2021_mustang_gt350.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/avast_antivirus_pro_apk_2019.pdfIn PDF document text
    • http://molefomisapeput.mypressonline.com/16681852290.pdfIn PDF document text
    • http://playmarket-online.com/430526475736bxdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_6019b4f8c2153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/used_lexus_rx_350l_for_sale_by_owner_near_me.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_c5c23d86e25846f3b249a4aea136b5b5.pdf?index=trueIn PDF document text
    • http://dafukip.myartsonline.com/vanosazubuxaxesuni.pdfIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_33e32e656738484b9516a33a23f7f618.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_68dfd0a7e417446dba4bb49edc424c27.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_928ab4e852014019b4908e102e4f77bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/93779256169.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/informe_amnistia_internacional_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/pediatric_ccrn_review_questions_online.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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 5192 bytes
SHA-256: 101f24df3c3a935db33d5fb0b34135442b3e1505605b6dba1364bd5de947e47e
font_01_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 10756 bytes
SHA-256: 86a2217c3dff6ec86c5fb095d31a3f49f6e29b96252267ed5af966692cb92022

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