Malicious PDF — malware analysis report

Static analysis result for SHA-256 d045be9ea1531326…

MALICIOUS

PDF

68.1 KB Created: 2021-10-03 10:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 348846b1f95e633b96cb3034a15c76d5 SHA-1: 7742632a09dbbb940de18bbdb754d210b099e60f SHA-256: d045be9ea15313266904a575a88b989c0f3193d4a3761d0cb733265d072ffb2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of link farms on disposable hosting, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2567dead---pukonadutujidum.pdf In PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/fuzokilizajinow.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/58845992548.pdfIn PDF document text
    • https://birudongker.com/contents/files/58728053828.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ae2ii9ne7lurhs71bofbqjb7p0/54323871195.pdfIn PDF document text
    • https://asi-filter.pl/files/file/kumijirep.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109241910225897.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/luvigitekakajofodutet.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/kafosedikikesatafifexaj.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/61199574897.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/25101534778.pdfIn PDF document text
    • http://seritour.com/rsm/files/73872049294.pdfIn PDF document text
    • http://texmet.pl/userimages/file/59936304802.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mosikedekuna.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/92043633003.pdfIn PDF document text
    • https://5uempat.com/contents/files/mirigivozejarurigeja.pdfIn PDF document text
    • http://garderoba.sk/images/_file/69892209141.pdfIn PDF document text
    • http://dezis.ru/uploads/files/24701501080.pdfIn PDF document text
    • https://eventaipei.com/upload/files/53843616111.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/45791118370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=facilities+planning+4th+edition+pdf+freePDF 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_off0000ab56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB56 10952 bytes
SHA-256: 38ae46d568102a67befa142b5d856ef67773ae7d84d95154ff261359d6bfc5a3
font_01_sfnt_off0000c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 15252 bytes
SHA-256: 02b7f4104223c02237528fa7d636619f7c5192e2fe0a4ed334435783f85556bd

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