Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc4e8a0250d10ae…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 15:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed19f6af501f0f1464e18c4e9ed03958 SHA-1: 8a91d39e412676d5e92ecbe3666d4eaf38421d9a SHA-256: ffc4e8a0250d10ae3b16ddef843e4ceff962c95b554a66dfa52a9980d0a53032
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The presence of numerous external URIs, many pointing to PDF files, suggests a campaign to distribute malicious content or phish for information. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://slhospital.com/upload/fckeditor/file/71013013091.pdf In PDF document text
    • http://artin-intranet.com/ckupload/files/62237488555.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nagevoxanorel.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/73994616753.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ef3b07b68---98168069766.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wemotuwojewoxog.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25790348106.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/satuzurozeduvixuropozifof.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/3451163166.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/45154482329.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/2980434898.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/30484363531.pdfIn PDF document text
    • http://lawngo.net/fckfiles/bagixodedakavopajukotufe.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/79383221988.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/vubuwoligetevaman.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tisamapuwuvolenidavu.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210914103815.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/40844462393.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/15022768325.pdfIn PDF document text
    • http://tid.vn/upload/files/zuwosumujanaka.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/45373974283.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/42381233034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dmss+app+for+windowsPDF 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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 10472 bytes
SHA-256: d7a034d6dea602af0c01fbf91a154c4df2ab38a6c599143a00c416bc6103d299
font_01_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 17568 bytes
SHA-256: c0d4ee5e3c6f3df488280c00ee3b24009ec66ac9b95bbb6e0c1fcd9c2671eb77

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