Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe02ba008162e41…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 16:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c6a8f23192da5ca53c3423bdd2604d4a SHA-1: 9e3fbfe823bf7ba565eb93d7a44d1e5503c0ba26 SHA-256: 8fe02ba008162e412998db75e9545d9193a08862e28c3335af22c9e3dd2ca525
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used for SEO-based link farms or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the link farming behavior suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://mezovuduw.ru/award?keyword=the+beatles+something+chords+pdf PDF link annotation
    • http://mamajan.space/archer_season_11_episode_3_reviewvbe1u.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/d3giPbU/game_center_app_iphone_xr.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/VidhjSn/46957127191.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/bJhhMhb/stacking_bullets_diep._io.pdfIn PDF document text
    • http://flowerport.market/familial_hypercholesterolaemia_australia_guidelinesjrlan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529281/normal_5feb9e6bdb465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465557/normal_6003ed5e587c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_60450a195b08c.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/jhhif9b/gesuvulitofefagarisaji.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hgiajjL/free_songs_music_itunes.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/qFXhija/cookie_makers_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_603e9258a1df3.pdfIn PDF document text
    • http://2gusevshop.space/spirit_airlines_customer_service_live_agent4wkjk.pdfIn PDF document text
    • http://meetsalle.xyz/please_wait_very_low_battery_ipod_classic_30gb_solucind8v4u.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/doPjggZ/21565387523.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/Kigiajj/oklahoma_football_recruiting_247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_0efd6236e51d40aeb0019b3a55ff254c.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_ffaa825447144cd5b141a9dbe214f179.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_33f3db3fcf4e4c349efb31188e4e5df7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuzo/3d_max_2018_student_version.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/ar_blue_clean_383.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_bea3e38206d44a468a079b9a6b5f4701.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/csv_file_from_website_using_java.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/rexinepomopox.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 6472 bytes
SHA-256: a22967577043f15ed69f1c8a9a89f7edf4be3ee7f8766bdf6fac29a9c8ba4575
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 5660 bytes
SHA-256: 20af41da31cb22da9f8c029fe90ecc3cbf22eda2188547d6d4b50fe48516aa37
font_02_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10688 bytes
SHA-256: dfc0ee695ac0454104ef365a56fabe3b4247d86452808c2d477b45f523bd0f06
font_03_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52

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