Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbfd9a84316337f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 14:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b10618415a65605b05877c09af202f6 SHA-1: 2194f01fe5e870b88f5d9b39c8517b9173ea0f8e SHA-256: 7bbfd9a84316337ffa1e1bb3b73d8e7a9d15adb6f10b914660843b56a4207d36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded within the document, suggesting an attempt to redirect users to potentially harmful sites. The presence of external URIs and the link farm characteristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://presentkompaniet.com/img/content/file/54936422191.pdf In PDF document text
    • https://atrax.eu/userfiles/file/50907764731.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75901304898.pdfIn PDF document text
    • http://santabruna.cl/upload/file/lilofibo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/5719097772.pdfIn PDF document text
    • https://ultralloy.net/upload/files/musibuve.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/56729144710.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/11934317713.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/62049269794.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/30402285010.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/jisevewivovitulemek.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/xepazimuvepip.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/18333753175.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/81343896416.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/notavogagisanepaxovukumif.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/povokubosovexopafagifuwo.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/suxajixawidijuvoxo.pdfIn PDF document text
    • https://cncunse.com/d/files/87299191865.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/68941664401.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/19922754950.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/ziwokevapoboj.pdfIn PDF document text
    • http://becucci.it/userfiles/files/54918545905.pdfIn PDF document text
    • https://spyboarcams.com/files/dilenovolefasepafenibagov.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131afba25607---68864484479.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/risejezanozowibosited.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mogilivonukazuxuxirir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=justice+league+snyder+cut+cravePDF 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_off0000b9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FD 10696 bytes
SHA-256: a21d5c808d7246adaac47cb936e7dae505b21c18e066bcc99ca6fe78311d03bc
font_01_sfnt_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16964 bytes
SHA-256: 5aa356b03964da20951ada1b8ead3091c4debb0620b7ca6d05ea0574e71d268b