Malicious PDF — malware analysis report

Static analysis result for SHA-256 430aaa12711c8f53…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69a5c67a1efef28c3e7b685c34502a2c SHA-1: 7e4bc910ece0722772270482e84f57c67cc79dd2 SHA-256: 430aaa12711c8f537ae1f459addaeb06579beba36c59bd61a31b281d109faee7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an intent to redirect users to malicious content.

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://daearesort.com/FileData/ckfinder/files/20210901_3E83AC50BEB25AF8.pdf In PDF document text
    • https://idd.no/ckfinder/userfiles/files/tozawizigexarovat.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351ef6dc4ab---74672108694.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/88748780625.pdfIn PDF document text
    • http://geasit.it/userfiles/files/badamagobej.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/36418437012.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/87095378346.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f392991f76---kuzojilalubato.pdfIn PDF document text
    • https://losungversorger.com/product/file/83219669194.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zebufefex.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/jigokifafameninor.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wafedufisawofuroxibetaven.pdfIn PDF document text
    • http://wsm.hk/images/files/pejufipimubesirapasuvamex.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/80326482637.pdfIn PDF document text
    • https://majubesar.org/contents/files/vojiwukib.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/majozefabevukupe.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/65818830093.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vulafotadepifir.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109042047489871.pdfIn PDF document text
    • http://exim5.hu/_user/file/zitukiso.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/redivumixeraxuwemop.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/zeparunulezog.pdfIn PDF document text
    • https://granitnet.hu/editor_up/37082132607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+cloner+for+android+2021PDF 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_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 17748 bytes
SHA-256: 8f0ce7a56d538e90289d5dfdb1d9483994bf5921f685d515f6e265bb353f1dae
font_01_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 10960 bytes
SHA-256: 40fb39fe6797b3f5356af4331a7db91ee6c6a4f4f2751f1f82985b2003dda5a9

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