Malicious PDF — malware analysis report

Static analysis result for SHA-256 d688292b9884a503…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 08:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef0fabdf572fa5eae31e808e3d4e3ea7 SHA-1: 4b3d531d1968e289daf8298cff1daa3677e3af5b SHA-256: d688292b9884a503b3ed7ef758a881302ff6c1f350515c4cc6dc8722e81edef0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous distinct external URIs, identified as a link farm, suggests the document's primary purpose is to redirect users to potentially harmful sites. While no scripts were extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://broadcasthub.com/ci/userfiles/files/56750109619.pdf In PDF document text
    • http://goldway.jp/upload/board/file/47516868270.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/wigodamogitutodotodu.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/gigili.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/97946250790.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631060911.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/rifumes.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210903_D4287DEAA59A822D.pdfIn PDF document text
    • https://cristalensi.com/public/File/xirobibigob.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/nolovuzidaxorer.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/toguw.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210918061019113.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wesowava.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/faxafodulijebajababavodu.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/21491967151.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/nuxosigediw.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/84988361877.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/guzejejubudukaxudorejob.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/70868412786.pdfIn PDF document text
    • https://anup.bo/images/files/zotizutubu.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/jojixotujigikuwelaxeguw.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/86722919173.pdfIn PDF document text
    • http://tayles.com/uploaded/bajoxuvagireronigoxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tubidy+apk+onlinePDF 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_off0000b4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D2 15828 bytes
SHA-256: 28e3a47d0bd34ebac33f203e945ae5eadfd929a15ef99bb2d8eb365e04e2aac4
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10428 bytes
SHA-256: bc880dfbbd44de311572c3e03a98123a07df9413815c59f64e4a905e02f5ad29
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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