Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bf428cbfa0ec0d…

MALICIOUS

PDF

91.6 KB Created: 2021-09-10 19:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cce49c911c085a30c164d645dc72bad1 SHA-1: 0653a66813673174a78fbaaf401e8608336eec67 SHA-256: 07bf428cbfa0ec0d688530b74fb080930527b62c3a9ea520cf74624180618b45
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent related to URL distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://ispartaorganizasyon.com/ckfinder/upload/files/94595062072.pdf In PDF document text
    • http://www.romanschatztruhe.de/img/files/tovelilisobobav.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/92365822088.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/65461063019.pdfIn PDF document text
    • http://leeandrewdavison.com/download/tunakomirosabapavi.pdfIn PDF document text
    • http://enewind.com/pliki/file/93511038144.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/75078249522.pdfIn PDF document text
    • http://woykoff.hu/upload/file/85364418050.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5080852e---25771922709.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/77746996601.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/80871370762.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/4171541432.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/fekusosujosirefeb.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/42647161003.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/61683413963.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/dizazuzikogorideg.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130212b6588e---bigaworenofetetepep.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/zogibesutob.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/vitetigimitebefitow.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/64204362197.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/67133159773.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/61776732137.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zupoxerebipokerakukeredew.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/35276420235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=yes+movies+online+moviesPDF 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_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 17672 bytes
SHA-256: 1ff4ab21cae24fa605d10f1c5d5e52f77d08256883035234001a00340c2cff10
font_01_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABB 9956 bytes
SHA-256: f6599a7a5bcb8cd543977f71cc15b5e8e75bcc74386d062718c63edd38dc854c