Malicious PDF — malware analysis report

Static analysis result for SHA-256 7365726dc8167aa8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 10:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6471692b25368dcccf1ab8038a09854d SHA-1: 26e523ce36dd67f9edb1dbba981d723b0945ccc8 SHA-256: 7365726dc8167aa879a6ca252958956e626d6228dfc1fa3ee10e374e8123d4b8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://hakkabrothers.com/userfiles/file///48786909085.pdf In PDF document text
    • http://maulich.vn/attachment/files/terewi.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/20463136265.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/7290610113.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/95028472936.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/wofomexuxi.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/gipiwajo.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/baxugasikuvuvotuv.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136962293db4---sujuridavimewusatenekoja.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xiguzerumajekojusef.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/velowuwedalowov.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/suderavapugepi.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/simekudavirekokebabu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/vupaxuvexixovuwofivazatoj.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/64601231537.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e18954c834adc6f2f8fc400180ccef0e/tomepivumogoj.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/rowug.pdfIn PDF document text
    • http://minipit.com/data/files/lulaluweruwonuzesetowiwaf.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/siwexorebi.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/ninufimakitepu.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210904030638.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nobijug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=remote+call+recorderPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 16988 bytes
SHA-256: a9cd74e4f90e99dea15119b2c70c4324bcaf766514ffda237eac5b7b4ecec150
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 10212 bytes
SHA-256: a791e2281dfc64ec6ca36827ac1a00ebda124c03bccf52179a324b65fcaa3629
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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