Malicious PDF — malware analysis report

Static analysis result for SHA-256 e427e3dfa72b0fab…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 12:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b6aab5a275c5022b5189d21caaef427 SHA-1: 4b767eab85a5ee71588950a3404943d52aa544de SHA-256: e427e3dfa72b0fab2154fabfc34a29a2e24ef96d0b2546f4b206a39f7b0c6734
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to external PDFs hosted on various domains, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161482dca5a7a0---gomixuwejesumemalizepuwe.pdf In PDF document text
    • https://aayams.com/userfiles/file/21366024261.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/nowaxibubud.pdfIn PDF document text
    • http://xn--fct8ml6mwue.tw/uploads/files/74596812278.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19f6bdb15---xemoja.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gevalavexat.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910224410.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/84273593561.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021921652326688.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/77569747727.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/madiwokuduvuwegoxamirir.pdfIn PDF document text
    • http://cresapumc.org/files/file/wipil.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/denav.pdfIn PDF document text
    • http://timocomputer.cz/files/file/29038644209.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090205295677468.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/29752291549.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/97339010471.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/84671277194.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/43081429697.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210921110940.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/zonuvajuzawodiko.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/9361590734.pdfIn PDF document text
    • http://akvarium-olbrecht.cz/upload/file/wisorixapejokofura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+emulator+real+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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 17764 bytes
SHA-256: c87ae867a6b2c753d49a6b6ff1511754ddbae901e7110732db39d249375497d6
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 10512 bytes
SHA-256: 57c074fa1e8257a9bb41ec90227af0faa6c84f2d719d02dd473bfb175d4bf060

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