Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27213150b168683…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 15:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 749ebbd2cfd0ea2c6fd6ede9e0a8b525 SHA-1: 41f80dea92effdff7d086a115a9d2defad47bc2a SHA-256: e27213150b168683b75b2a9e52fdc8ef7c903dbaf0210ffe2e7676d7afb5fa46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spam campaign. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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://w-mill.jp/images/file/nolelixumixu.pdf In PDF document text
    • http://airmon.hu/images/files/luwiwomotozefawudedo.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210903141412.pdfIn PDF document text
    • http://wohntraumgmbh.at/81494140533.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32149388531.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/gatem.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-19/20210919053453357929.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/wataseruku.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/28876348481.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e5abaa1a---tadenutiwewowubavatafupug.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/37601650295.pdfIn PDF document text
    • https://petek.biz/resimler/files/kapiwegurinenujobaja.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wifuvujopixolarik.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/71541319631.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/23126200469.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1b8d118ba1b3c60709c6589f44d67d8b/57248136128.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/39099784702.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/60131759179.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/lajaxuxabo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xupokuwigep.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/jasagurinuxuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=logan+paul+fight+free+live+streamPDF 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_off0000c7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 10928 bytes
SHA-256: 6f163554c6f7239fcdf3469a8476155cff72a52f83128375f3b36a6642278d2b
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 18596 bytes
SHA-256: 7edbddee66820fd0f2af9f1dc71f3175ffd88fbcd697b0298ef01151f1a40d3c

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