Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6705e6b96c825eb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 06:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12b6d09b76cdf31ff917c57c3065d795 SHA-1: f60a297e97a0bb1bde98885ac0c46b9d26791dee SHA-256: b6705e6b96c825eb00351ee742ab8b1d37fd3433db4a4ca0a2e495397589e16c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. No scripts were extracted, but the presence of numerous external URIs suggests the document's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://irlanc.ru/uplcv?utm_term=pause+and+resume+video+recording+android+app PDF link annotation
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105816663053.pdfIn PDF document text
    • http://kisito.com/userfiles/file/49475118935.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/92419711068.pdfIn PDF document text
    • http://ecole.ru/text/images/file/gumoboxo.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xexinomesasabuwino.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/21327118079.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/pejasobolo.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/lubilazisutefamikupelif.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/92321962046.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/japerosogiwasesati.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/fotevowewosuparagi.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/goxuzuwodigewibuwusawob.pdfIn PDF document text
    • https://o-dance.com/upload/files/98954200558.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/10069812749.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/59616276187.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/74692571496.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/44446595500.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/49302082618.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/13243350774.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/lumozazapofipufiludetaviz.pdfIn PDF document text
    • http://ymmicro.com/files/files/7440542723.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_off0000b754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 10880 bytes
SHA-256: a961c2c0f889d8d699ab7019ff56baca177dc6d622d6f75e49aee31708191c3a
font_02_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 15692 bytes
SHA-256: e740fb4ecdef89f6a8beee129da8d17549dee5d512d70bb5098a335539019fec

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