Malicious PDF — malware analysis report

Static analysis result for SHA-256 2274a24336f16d6b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 18:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42818cf4dc1b4644cb935252a5f79a44 SHA-1: cdb83549c8421e7224dcb71639c88dcb768bf0c4 SHA-256: 2274a24336f16d6b29ac5b6fb502bc86549f2f17e03e52518a0890295cf59357
146 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, one of which uses a raw IP address. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://xszhuhai.com/uploadfiles/files/32917349337.pdf In PDF document text
    • http://nuk-amro.de/userfiles/file/91012468088.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/mofavopuxufarev.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/piliwaruxukojudal.pdfIn PDF document text
    • https://datajournonepal.org/files/tididusinisekojaker.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/gofuvelevejatolidituzi.pdfPDF link annotation
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/xepofikamozuniletefosab.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/12901180716.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210902021342.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/75775241342.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/wuludaxivobimapejudew.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/futavisufisexalibit.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dekudapa.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/82204125696.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910031150.pdfIn PDF document text
    • http://surestegc.org/documentos/file/bozufugorokeweziganorizum.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/6338903937.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135416bb5486---vowakorawupujemurexar.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/sujamujiwevog.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/ruruwijaxumavunig.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/zonida.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/63912642298.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/56196809182.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vunoriwu.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/fidojuxujonubijov.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/18700071881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+english+spinachPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/kasiwolabo.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_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 19044 bytes
SHA-256: 9a234c264a7c05294032b1cbb53a46ebf96776b83c5bf229d9786ea53b21a202
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 10428 bytes
SHA-256: b3492378ce5d03a9b393092339ac75e84173d25655fdd0a74d84d948569932f1
font_02_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1