Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1736c0165e77a99…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 11:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96e7802943701e84daeea46773b2513c SHA-1: 35423d081ca6bd7dde8729ab4e86455d96d55fd7 SHA-256: e1736c0165e77a9916aaede6c8420767cb68b02004c326cb17fec286345d4669
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or scam lure. The primary IOC is the embedded URL which likely leads to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=show+only+phone+contacts+android PDF link annotation
    • http://epodhajska.eu/UserFiles/File/mudusijiwunuzuxogamadup.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/zazubizoselo.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/51068842935.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/44803036585.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/82568999481.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/nujeko.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/metijuwixopadozaka.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/95858801890.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/widiwinoxinulajekebenus.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/433503315613ae33a54cbb.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/zeforopogirudokove.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fatalapenedoj.pdfIn PDF document text
    • http://wjcopy.com/upload/files/25570038707.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/29219627894.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/sakujox.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9ef6424cefce790df6a510c864d66e77/20017366817.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/lowixonurimixulexobaromu.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/21485505964.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/jusujimoxumupowupolejusor.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/28993534364.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/pefij.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/bonexuso.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/1479448124.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0e1afa0a---pujalazu.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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 10888 bytes
SHA-256: 2ecdcadd2904fc9fd69928143898a4d1b05ab24e02a0920f909f0430d5147e15
font_02_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 17620 bytes
SHA-256: e8cc3e1679147391cd56a28549cdf35d60b1b0f09715c88ae3bf19cacf5b500f

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