Malicious PDF — malware analysis report

Static analysis result for SHA-256 303f5aed5177fcf0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 05:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 650bf72d02b5b781e979bcec9e4d5e9d SHA-1: 7ef596b0c34fd21be5db30f61822caf5da61ca5e SHA-256: 303f5aed5177fcf060d23b1081ae5b8c13d49d7a19caa41897b6ef4a841ea098
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to redirect users to a large number of distinct hosts, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://yusungchart.com/userData/board/file/bosojumamexiliwetanibore.pdf
    • https://ambient-interier.cz/files/files/25682377258.pdf
    • http://beautybybelief.com/admin/images/file/64419650704.pdf
    • https://ijtm.in/userfiles/file/kalidutojuwedulapav.pdf
    • https://1tlstar.com/storage/uploads/files/viziladukid.pdf
    • http://villabrown.it/userfiles/files/telugapos.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/34372560582.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/43226418501.pdf
    • https://ctners.com/ckfinder/userfiles/files/pivete.pdf
    • https://plewmal-d.com/Uploads/files/42268370691.pdf
    • https://swaarm.de/app/webroot/upload/files/zefeduve.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/wexebixanexikabamogo.pdf
    • http://uzks.hr/upload/datoteke/28489513363.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/55012144205.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614151f1d4631---45082919639.pdf
    • http://www.sctiec.com/up_files/FCK/file/71181779134.pdf
    • https://ecohort.info/userfiles/files/sajunenarirutagalasinulap.pdf
    • http://valdhans.cz/userfiles/file/depamodexujumemoxasumi.pdf
    • http://tycoonmedical.com/userfiles/file/sokolupizisuwu.pdf
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/88632303433.pdf
    • https://heritran.vn/uploads/news_file/xokalam.pdf
    • http://energywork.pl/userfiles/file/55014703272.pdf
    • http://nmways.com/uploads/fckupload/file/sitegapotiriparazubetikob.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161428c798452f---15736449914.pdf
    • http://leaders-adv.net/userfiles/file/29622236260.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/16071569884.pdf
    • http://enovosti.info/ckfinder/userfiles/files/5160320757.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watched+tv+multimedia+browser
    • 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_off0000c4c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 16792 bytes
font_01_sfnt_off0000dcd5.bin
d7958949d16c0a111cc004c2e4a413c04cf1c1a120cb0caeab1675ab70ca3719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 17436 bytes
font_02_sfnt_off00010a25.bin
7006d31ffbfffcc0705e12752e8af4caabd7a941db8608d384b5d00f00dad0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 10916 bytes

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