Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b44e63f81185c4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 18:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db7d1ef068fa6ed8cbec521655d103ac SHA-1: bb075229dffcdad0045387b442bbd3fa1205978e SHA-256: a3b44e63f81185c4365d78270ccd00fe306cccb5d065d553946bd0624cd26f87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://partnyor.az/userfiles/file/85191167961.pdf In PDF document text
    • http://hulstcustoms.ru/uploads/files/28311867928.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52da61b85---webamadebo.pdfIn PDF document text
    • http://texmet.pl/userimages/file/38666154057.pdfIn PDF document text
    • http://ridendo.cz/files/file/52026001402.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/bkcdj8g1ch1194c0pjohnaisl1/makumoluzojomafe.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/xopajukek.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/73496378026.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/tarorufuf.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/tavowuwumezedijem.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/wuxafogup.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wosusolate.pdfIn PDF document text
    • http://punaide.com/userfiles/files/tolamisubuvi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/pavesitalezope.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/veledepususadaviputan.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/pefolo.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/suzelimozajetuv.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/fakaxovesejewumedeweneviz.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/50870865415.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/fufanozijumepuvav.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/gonapifelisew.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/wobiwavedekadomedewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+android+id+and+imeiPDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 17448 bytes
SHA-256: 545ed73d5b1f265a1889adee5efb3a0f9182f8c93966f42ffbc9485d0dc46b17
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 10680 bytes
SHA-256: c4169a1822081adc34377495c6ab191a43de4184c44e05aa59db2af1c2b8b4cf
font_02_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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