Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d34881d4639a29…

MALICIOUS

PDF

76.4 KB Created: 2021-02-19 15:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6b6de33e4d8be27857f2a2b69781cc83 SHA-1: 410945d248bdbbe645d0d154c85c1d042c1e31b6 SHA-256: 19d34881d4639a29b569de671438af46f693b91d402352904cb17283d7c4b069
66 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm or SEO poisoning campaign. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the URLs. While no scripts were extracted, the presence of many external URIs suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=does+retinol+work+for+stretch+marks PDF link annotation
    • http://help-copyrighteamservice.com/anemia_por_deficiencia_de_hierrozbug4.pdfIn PDF document text
    • http://makamar.xyz/18146187626df0gj.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/wggjerY/fun_101_okey_cekilis_hilesi.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/Sjdihid/from_the_sea.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/xehfHie/cube_defense_discord_server.pdfIn PDF document text
    • https://cdn.sqhk.co/lerutefo/ehgjgji/bidironetuwugunasogofo.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/hfpEMe7/44799727663.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/hfjeoib/soccer_star_killed_in_car_crash.pdfIn PDF document text
    • http://infokurs.design/head_first_java_2nd_edition_source_codexkl2e.pdfIn PDF document text
    • http://fly-drive.online/vocals_only_maher_zainoqjq2.pdfIn PDF document text
    • http://znohist.site/linutodadozuxugogor1qiwd.pdfIn PDF document text
    • http://revershjtb.site/kuta_software_simplifying_radicals_imaginary_numbers_answersqe2yk.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/eP5gfkA/3_on_3_nhl_arcade_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/LgUSKhc/warzone_zombies_quad.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/gcLdzbm/water_slide_rental_miami_homestead.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/bisapovepizaj/vascular_malformation_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/cement_wall_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/32101416633.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/statistics_cdf_and.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/html5_video_player_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/98671383994.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_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 5276 bytes
SHA-256: e6e5346025a72a9e2bbbbf472dcce26a00776846fcc902bd8b3f003267798748
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10240 bytes
SHA-256: 5c5082a998cf139ebdf7aca62d78479beab2ed2af96603cb0e81f501e577b3e1

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