Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f81b2bff0760f7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 05:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 415c89a63f28bd6025c7a65db18b145a SHA-1: 63e16b947a079e8e567c1d9301eb6bc2272486db SHA-256: 11f81b2bff0760f7ba745dcdb06dd82fb0ebf7be3762bcbb33e681712d275ffa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lnianemarzenie.pl/userfiles/file/48020997795.pdf In PDF document text
    • http://ccshecea.org/upload/files/vovapomivifiwetemevupaj.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/2857793081.pdfIn PDF document text
    • http://temple.mo/userfiles/file/9338327599.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1010530177613aac259ccc6.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/silenipetuvepaki.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///texekuxexesul.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fazamuziliwezamifutir.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/38546540833.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/pejulegojemukekuseroxofew.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/tumawuvisirasizexoti.pdfIn PDF document text
    • http://abnicum.ru/files/file/89394381973.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/zobid.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210913_0E02AEE5441B3F9E.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/rulawovadufapifevuko.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/tonugimeba.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/32755930870.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/58459721754.pdfIn PDF document text
    • http://artediapharma.com/upload/files/venonakixela.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/zojarabinifiguforizomeb.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/28555410782.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/pebofaza.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/48817108371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+5+mod+apk+in+androidPDF 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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 17848 bytes
SHA-256: 6f877933402b8cfd24c9e07cce4862220ffe671f1db757884ec4c78ef11db2da
font_01_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA3 10472 bytes
SHA-256: d8774eb601f5314624971c011274ba56e6b56b5e1e8473b7e5c56c6f02c103e8

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