Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fa67559b6a3bf3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 20:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 239bc518f850b2226222aec989a3492a SHA-1: fc6478bac3f92c7291b16f329978c7cbdb5a8f53 SHA-256: 55fa67559b6a3bf3dd5e143680cfc6f755dfa694eeda79152faf052959bdd6cd
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and numerous URLs point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.ih-consultant.com/ckfinder/userfiles/files/lebazuvamorixenod.pdf
    • http://it-hair.com/userfiles/51996893288.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/96798238634.pdf
    • http://kingsap.com/file_media/file_image/file/misiminaxakiredanibodivex.pdf
    • http://rilta.net/userfiles/files/53604495669.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/52113486631.pdf
    • https://dongciao.com/uploads/files/202109051130123565.pdf
    • http://matras-devison.ru/upload/file/60471789232.pdf
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/minulozetizarodo.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5674f996bc25810c4c0e9154229300f6/91518293301.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210905_C2BCBC5C9C815C26.pdf
    • http://yarpb.ru/pic/userfile/baripoxulerexaridov.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/1361610119.pdf
    • http://openendrep.com/userfiles/files/95579422777.pdf
    • http://eros-arena.com/eros/userfiles/file/48361614453.pdf
    • http://kiko168.com/UploadFile/file/20210901212050172.pdf
    • http://esejsc.com/upload/files/10542773713.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/33853537399.pdf
    • http://centrons.com/uploaded/file/68399117613ce3cccfb7a.pdf
    • http://dietaltop.com/userfiles/files/nuwawuvusowafe.pdf
    • http://linklandhotels.com/upfile/editor/files/jixiliwase.pdf
    • http://arohitourandtravels.com/userfiles/file/gagatofonajijal.pdf
    • https://marugame.hk/editor_upload/file/36602774552.pdf
    • https://majubesar.info/contents/files/98608203061.pdf
    • https://makenie.com/upload/files/67469244566.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=yttrium+atomic+radius
    • 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_off0000d0a5.bin
ec95ac545e282e55cd671d622d200897990b588963666f5fe138edc40af88158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 17196 bytes
font_01_sfnt_off0000fd5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 16792 bytes
font_02_sfnt_off00011573.bin
91f22f99547f7485357fab8c4fe75dbc64015a4d1776730edf6a8d0082cb3fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 10332 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.