Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfc12a4b5443105…

MALICIOUS

PDF

79.2 KB Created: 2021-03-16 01:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9c2f9281a3ec70246bcd4afe42d34fef SHA-1: 0c128bf3c0142678f67aea913090b8fe63c31fd2 SHA-256: bcfc12a4b5443105bb972ab0615f3f776fa553c0a90f60ae3dcadb576de990dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a likely attempt to redirect users to malicious sites, potentially for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/123?utm_term=sum+of+finite+geometric+sequence+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fd091d5da2cc.pdfIn PDF document text
    • http://dukafufuxona.iblogger.org/vuparasukikisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_6025ede7e7828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381098/normal_5ff0bc161f7e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385204/normal_5ffea5689f080.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/the_graveyard_book_movie_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fc7328136e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fe2f7d6e83b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501495/normal_60021d2d6451d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_4ec59e61440d4cbbb142bbb662f98469.pdf?index=trueIn PDF document text
    • http://pepiretivixu.epizy.com/parineeta_bengali_movie_2019_songs.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_753bc599480c4483ab87adff1ab68d78.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_a5fa9e48f18042dbb22e13515104f58e.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_c3e73440d4694b02a1d9eae45ec3507f.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4222e6e7dc81497089fa1fd7fee76562.pdf?index=trueIn PDF document text
    • http://zapavuvezozetet.epizy.com/ski_cypress_snow_report.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/how_to_factory_reset_an_hp_pavilion_dv6000.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 5440 bytes
SHA-256: b52c6b69d75ade3cebb6c2acb1474b3da5e3525d68ccc170fb974aac80f784ea
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10900 bytes
SHA-256: 185310d55e99e98521f2a10bf9c05c6003cf390852d5c354cb00c0e2a10d85c6
font_02_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 16708 bytes
SHA-256: acc475967c70a78bc2cccffe2ffb64450d0cff0b161576c9e64305c0fff63dad

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