Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa71093483ecbe5f…

MALICIOUS

PDF

84.2 KB Created: 2021-10-05 11:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e75ee4af58b28f40c8256816055e4eac SHA-1: dbd40770238664bf1f5fc22b51b5ee0eb4adfdec SHA-256: aa71093483ecbe5f6f689a55ed1144429d1afb79c172abdca6fe2004efbc3b82
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to distribute further malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://qdxqw.com/uploadfile/file/27177068484.pdf In PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/85024196793.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/46736176914.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/96560425801.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/xasinopufefanedan.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/15668571210.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/40988304500.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/dagobumotilurezadokuf.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pidigeku.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e12582e70d894c267b086d42dff02c3/43020224877.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/84250718442.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/momupegebeganamawep.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vurosedojogesabalex.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/jokuwuvoz.pdfIn PDF document text
    • http://bckvalumni.org/userfiles/file/lafevuvifininemosup.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/1891163831.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/gidoliwujidexuguzeran.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/27638369495.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/madorunu.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/93993626981.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9fa07deb---55146094155.pdfIn PDF document text
    • https://triosms.com/userfiles/file/19190810143.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/87982403303.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/nabarekowezenukajusimum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=camel+has+one+hump+songPDF 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_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 19592 bytes
SHA-256: 7d4a68cec12368d4b03cb6eba676541be6a7c179f1b592512f52588ed8878ded
font_01_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 10540 bytes
SHA-256: eb5a6a514226521108ab483a0f1faab8951abb89f50f226591b8932ec41e0bee
font_02_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1