Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb375fcc10514ef3…

MALICIOUS

PDF

113.8 KB Created: 2021-09-06 20:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c0ed1cccff0d0ec38f1c006ce447ab0b SHA-1: 394f5f025bf794c2400a71ec31da5b5f976b3c90 SHA-256: bb375fcc10514ef3fbd37775ef76bc607b65d8cd38607b61646d4b00527f42d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://inwebjor.ru/uplcv?utm_term=angularjs+openclassroom+pdf PDF link annotation
    • https://alcoquimicos.com/ckfinder/userfiles/files/kosovujawafaxarubido.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/kagidovikojofelawo.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/50058891779.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/42325465515.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/namigowuju.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/42580330046.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c8646054b6585d4e18b0d26f906c28d0/vizaxomaro.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/29452504048.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/77903211280.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sedixir.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/75857162685.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zukod.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://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_off000155fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FB 19212 bytes
SHA-256: fc8011b854ef00b9d9b2fbc74d2f2a14b5dac4d04bc147818791b1e4146b74fa
font_01_sfnt_off00018914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18914 10984 bytes
SHA-256: 356291a91fedfa792cffdb0742fa5a204d81a4e1e4fdba7c65f17063179c37b1
font_02_sfnt_off0001a271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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