Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cafb84a5ede7c7…

MALICIOUS

PDF

77.7 KB Created: 2021-03-29 22:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 15afec22f7e37bfc22c9bfa609df2b0b SHA-1: 765c2c24babe58841311cc466f3c047f86e6caef SHA-256: d4cafb84a5ede7c74247643411af6de3c7f9ba5c0146d5cafee05cca25a36589
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=employee+payroll+management+system+pdf PDF link annotation
    • http://lovemecompletely.com/special_bodyguard_2018_free9zu58.pdfIn PDF document text
    • https://fowezojufogomod.weebly.com/uploads/1/3/5/3/135307270/rufetifojetituv.pdfIn PDF document text
    • http://navalny.design/what_happens_at_the_end_of_you_should_have_lefthhhz6.pdfIn PDF document text
    • http://kind-insta.site/3328396854mbfes.pdfIn PDF document text
    • http://fredo.run/bluecoat_proxy_deployment_guidevl2ym.pdfIn PDF document text
    • http://fsbsiod.com/pazaza6zxi1.pdfIn PDF document text
    • http://card2card.live/what_temperature_to_apply_concrete_sealermcv68.pdfIn PDF document text
    • http://samozanyat.info/wawopobekunexugemojeonr7.pdfIn PDF document text
    • http://ketotreno.buzz/731544284946gg49.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/gazojodi.pdfIn PDF document text
    • http://helpcreditscore.info/duromax_generator_12000ewvyls.pdfIn PDF document text
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/dilofuroz_banonaduk_waxari_koxiwavudiku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_7cf7ab0aa14e4a5289ccb2c2fbe9973d.pdf?index=trueIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_a5af5e6cff1041dd9737e11dee105981.pdf?index=trueIn PDF document text
    • http://fefaborap.rf.gd/how_do_you_do_a_double_crochet_stitch_for_beginners.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_3c0d9d69685c482dbc6ba56c97791ca9.pdf?index=trueIn PDF document text
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_fdfc5961d7874045add7c2c85cae5ce4.pdf?index=trueIn PDF document text
    • http://falogivaxaf.epizy.com/88272567924.pdfIn PDF document text
    • http://jegafat.rf.gd/54384690819.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_4653ad5249e445bab4e73e4a59533650.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_f564a1d248cc4e3d857c47f5dce09cd1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 5420 bytes
SHA-256: 875e16049964f6cd0733030ad058670ff5df3df14de2467643307187319b1b8e
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 10968 bytes
SHA-256: c01498a7712d6b6e50495557070ce81c1ce053895f7bc774975cc58d6a1cd161