Malicious PDF — malware analysis report

Static analysis result for SHA-256 650b562aad9f5137…

MALICIOUS

PDF

118.4 KB Created: 2021-04-01 22:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8e187444e651734058a5ef76539defb3 SHA-1: 72c520d84fdf4b93cf7d518e0105948bec6c6f8f SHA-256: 650b562aad9f51372c4a08fe80d5870230a210b80ca92fb8c4c9376b36a2053a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to domains with unknown reputations and are structured to appear as downloadable files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, references 'Hx stomp 3.0 manual', likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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://nipisod.ru/strik?utm_term=hx+stomp+3.0+manual PDF link annotation
    • http://zahlungsservice-ch.site/how_fast_is_a_kawasaki_mule_gow027m.pdfIn PDF document text
    • http://luminar2-download.xyz/1000781778359hej.pdfIn PDF document text
    • http://caterm.ru/753706610797sl1l.pdfIn PDF document text
    • http://cardioactiveitalia.site/16241968806o3nrx.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/finch_and_cotter_custom_constellation_map_poster.pdfIn PDF document text
    • http://maddot.space/bepujvbf1n.pdfIn PDF document text
    • http://gdztut.com/descargar_11_minutos_paulo_coelholx047.pdfIn PDF document text
    • http://chelamela.org/10942015094zuaew.pdfIn PDF document text
    • http://spindlndou.space/kirunufuvefujenowamu9t3qc.pdfIn PDF document text
    • http://moitender.org/vijopejegimulinulugaguph5n1z.pdfIn PDF document text
    • http://3bureaureport.info/gunamamevirevopiniwunoxuvkwtc0.pdfIn PDF document text
    • http://iciko.xyz/mutoturuguzitelufrwkc.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/axum_kingdom.pdfIn PDF document text
    • http://theplafond.xyz/speak_novel_chapter_questions9pkcx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_e95a54f637bb4826a65a4fda6545041e.pdf?index=trueIn PDF document text
    • http://nogafojomor.onlinewebshop.net/adding_and_subtracting_decimals_worksheets_7th_grade.pdfIn PDF document text
    • http://dijipola.onlinewebshop.net/diccionario_biblico_vine_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f74064-5887-4c5a-9e38-0bd4707e38c1/que_es_una_destilacion_azeotropica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c527e20b-cfca-4a77-bbae-ea5a9115d98b/42249773798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed85415a-30cd-4e7b-87ca-481757f856d3/bubimewe.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_53fb0740fef2472cb1f4d7329926292b.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_0c181de0851d43579115b855b9fc1f48.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_efec9a2f8adc40298366b328acf54f4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9395c4-1917-46a6-9b31-3ad849a8a8a9/donijozomabipanow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c0165e-a22d-48b1-91a6-da99cc0dced6/aprilaire_thermostat_8463_not_turning_on.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000161e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E1 4952 bytes
SHA-256: 4bdf03d266ddd3546369e218fe8946db0e283a4fee3ef6080c9d14a00ba4f9db
font_01_sfnt_off00017298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17298 2524 bytes
SHA-256: cf83f4c95068ebbacbdf44ba0b4a878e71392e808930957db7a593d6986696d5
font_02_sfnt_off00017d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D74 12276 bytes
SHA-256: 19f9a53ed771ef61bee3bdb10777eac959c5b3c91abaf8742f307c7f0df9713e
font_03_sfnt_off0001a711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A711 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_04_sfnt_off0001bc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC41 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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