Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ba2485f8c2b56c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 17:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efee662c77ff2ca122a8521b9b073495 SHA-1: 0bcd68f278c519e4db963b2e08f903c92fdb7653 SHA-256: 23ba2485f8c2b56cda90408960bbbda26c5bf68c1fa356fa96f7c7c23ec05c08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic analysis indicate a link farm designed to redirect users to download applications, with one URL explicitly mentioning 'wifi password hacker app'. Although no scripts were directly extracted, the PDF structure and the nature of the URLs suggest it functions as a lure for malicious downloads, likely involving embedded JavaScript for redirection.

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://aweibel.com/Photo/file/89366691427.pdf In PDF document text
    • http://ff-engineering.com/userfiles/files/nipoxikediwadenutis.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pesaw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370433a1165---48487929879.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/petixotawowogewejora.pdfIn PDF document text
    • http://finchamauto.com/pics/37579381244.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/9488055748.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/30124493253.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/52631212783.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gituvobopamikujifoxonom.pdfIn PDF document text
    • https://interconformity.ro/images/file/1661162755.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/ripiwotudabefigigogada.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/10560011621.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/niwovivo.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/93268249544.pdfIn PDF document text
    • http://dalaichau.com/files/jowezulizozuxodominemakib.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/75055658012.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/13456111623.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/xitevatefewu.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/9119069001.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/40928491593.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jokuzul.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/vumoru.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/53203518013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wifi+password+hacker+app+2020+download+windows+10PDF 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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 11084 bytes
SHA-256: 43af035a5e100c01a035666bcb664bf330f4bc5a6f83b68d47cbcc97dff836bc
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 17520 bytes
SHA-256: ca289902f57ffbcfc1d5e2df31322cd610fe7aa592dac18362b7f22d0c5998a9
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1