Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce36f9185bfc4ab…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 02:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf89a490d46f497fa24e97aecff0be27 SHA-1: d0f55a7ca31cac0603fa56372b069af2bda05029 SHA-256: 7ce36f9185bfc4abebc755cdc0b9da99c728562ad6aa3c9eb7233ffc6427f04a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://astdubai.co/userfiles/files/wevis.pdf In PDF document text
    • https://sealskinz.ru/files/file/mabafixeduluvifugifaxeb.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/72762170846.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/nijaliluwutasubavidekoj.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/pejofugatotodiwolozujab.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/xidazogotunatedugugax.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/21621582948.pdfIn PDF document text
    • https://12shio4.com/contents/files/miraremixidabi.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/rulizi.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c28005445de3baebb2d03c716e176fd7/jufiruvog.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/91731681196.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/73559321762.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210918055608424.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5501998105.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/1696562530.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109160747307087.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/37821940350.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/32255472918.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/28375255610.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/rukubag.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e599b08f---44912428764.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/joxavekuxuxopujif.pdfIn PDF document text
    • http://napiarsaigh.com/images/redevabebanobixanati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=linux+emulator+for+windows+7+64+bitPDF 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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 17764 bytes
SHA-256: 5683dcd2f05bd78bb1f6b5c52939714a768c30e5c1f6fb4fff2739d235d18701
font_01_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 11196 bytes
SHA-256: 2439c5b0661812325e9272d877750f42faa5571ae8b076134ba7bdb0a588c89d

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