Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c49c9b9182d585…

MALICIOUS

PDF

76.4 KB Created: 2021-09-28 13:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be90203eb87f9d75c1a168eece81b5ab SHA-1: 13ac7b94cd661712c5ee1f351b5dbde1daaa3ac6 SHA-256: d7c49c9b9182d5859586241443b1bb85e4ca2c553af23fe9148f70260a195a4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to disposable domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the nature of the PDF and the link farm suggest it is likely intended to redirect users to malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--49st2et51duvk.com/upload/files/rozomizi.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908150432762764.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/sajavubelejagasalowupuxip.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vawekitit.pdfIn PDF document text
    • http://profstil.az/userfiles/file/gusenabukubupijojapob.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/mozariwetidazasem.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/xusata.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4c709f7e1f4ec654d019326a568f27f1/53280348149.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/kozetutipijetad.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/jibenegeluparu.pdfIn PDF document text
    • https://efnnma.org/files/file/romabifexedixunirak.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rutoguvokinudubazixex.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/32905980397.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/32942587961.pdfIn PDF document text
    • http://gespk.com/userfiles/file/zuvurowijujawelasuvu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/88843692313.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/fulagemugijuzepugixir.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/japidujorumewumilaboguka.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xajubekipudusewarotilape.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905030600.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/96674838091.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/49214530907.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/tuzoxobopomal.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/80780350592.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/35086561754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=uuid+android+devicePDF 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_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 10224 bytes
SHA-256: 62c878810acb42ef1736a6b6b65dd8d9f23c220a7b2742085e31f951a3e40506
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 20404 bytes
SHA-256: b982b7baec3a42cb05c7e57aec1397977a642252d3ee33799b926f85bbdfc526
font_02_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1