Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38c7263d1dc56e4…

MALICIOUS

PDF

98.6 KB Created: 2021-04-04 07:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4385bf30eb1eef25250d46a561e10a97 SHA-1: e81a27bf440a054234570d53c648ba73e78948c7 SHA-256: f38c7263d1dc56e4e5fac3f1b5ce728f0d115b4cff6c9db09a51e04b61c7443e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links, many pointing to disposable hosting, and one specific URL is presented as a "Microsoft excel vba programming tutorial" to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://xajibur.ru/strik?utm_term=microsoft+excel+vba+programming+tutorial PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5fed63f288530.pdfIn PDF document text
    • http://app-3null.com/41841906474pb8jr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_60068db6e1548.pdfIn PDF document text
    • http://welilenasosuda.22web.org/5183843387.pdfIn PDF document text
    • http://sosed.market/84997773594u26oe.pdfIn PDF document text
    • http://womenalikumat.22web.org/88231134968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5fe6fe7520c11.pdfIn PDF document text
    • http://napojenewojiro.22web.org/relationship_between_authentication_and_authorization.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/gutewikuxedijagjtqxa.pdfIn PDF document text
    • http://particulieres-societegenerale.best/my_talking_tom_cat_2_hack_versionswpjw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzojora.atwebpages.com/indoor_air_pollution_sources.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_18b00434264a40f9936ff745dc76b202.pdf?index=trueIn PDF document text
    • http://xufolat.atwebpages.com/gakagi.pdfIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_aa393076b9f045c7942e2e26eb6c0c85.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_812d13c9f7524fa8ad964a43148c8bc8.pdf?index=trueIn PDF document text
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_bbd32b2455964a1eb6712d35b6c5928b.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_6b4382bcdcdb4a4fa4b942fe3d2a595b.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4dfed57e897b461386ccd5ead0a809a8.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_3172dfc5303c4352a42e7ac44194cacf.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_f603350a1d5f4524aa20c88d11be6175.pdf?index=trueIn PDF document text
    • http://pinukemedorurol.rf.gd/kosirolosir.pdfIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_db89a60c05e24cd0a853d0ec0326d24d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 5608 bytes
SHA-256: f62510de2bd740a0e07ac5794532f1cc06bde0cccffb2b1bc18936f73fee8727
font_01_sfnt_off000140c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C1 10864 bytes
SHA-256: 68cfc4b306510ef9ed132692e9f5ccc062e2c080510b33362cdd58bf97d734e7
font_02_sfnt_off00016625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16625 16620 bytes
SHA-256: d1a38db9ff8bb7d0a9dd2d42f5b8f6fdf2cd6f25b146f381dadce01f6d9aef6e

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