Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f448fffd718e486…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 06:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9a71fde5802a05b9aa00a40d99600d3 SHA-1: 4eede469ff398542098b3fcc951d7298958705ae SHA-256: 1f448fffd718e48666375e7b723e7a74e36b91abbed111fd63b0f4e3fcb091c1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to other PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of multiple PDF_RANDOM_URL_LINK heuristics further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/dofebimekomotipatitugis.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/69143185783.pdf
    • https://tylbm.com/Upload/ckeditor/files/zoziveb.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5009a174de452f86697ef98b29f462d5/47685647958.pdf
    • http://ubestsports.com/imager/files/20210909135601.pdf
    • https://transmar.biz/ckfinder/userfiles/files/81001340908.pdf
    • http://heathrowairporttaxi.website/userfiles/file/17166139878.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905044939615542.pdf
    • https://nabijdefossa.nl/upload/files/videdogi.pdf
    • http://qqsbg.net/uploads/file/sutazam.pdf
    • http://mptech.vn/ckfinder/userfiles/files/gupatuzelomameme.pdf
    • http://massimosusto.eu/userfiles/files/mituzedusuromolewobu.pdf
    • https://heart-calligraphy.com/uploads/files/202109180628481698.pdf
    • http://thegioixedap.net/upload/files/13373070118.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/potazapitufegowixanizodum.pdf
    • https://wecareu.net/ckfinder/userfiles/files/53781821653.pdf
    • https://geloracinta.com/contents/files/71804952340.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/gegivoxukilidebiwiz.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7959ab149---zajaf.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/tidebuwivoxezu.pdf
    • http://akcjonariusz.com/UserFiles/file/tudalumabitelawibesobopel.pdf
    • https://nistd.in/userfiles/file/vowolituvumakili.pdf
    • https://immo-macedo.lu/userfiles/files/xewilunix.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wozurupavowasifelogata.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+change+mp4+to+mp3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
font_01_sfnt_off000103e4.bin
fd970d30800ac5454705b7e200eeeb1ef7fd1ed935e0ccba908b6a4718fa5e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 10976 bytes
font_02_sfnt_off00011d01.bin
0e15b8ad97fdd5fdce2c7705b9bd2d30cef6765adeacc7ecd85af2d54d54133d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 18116 bytes

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