Malicious PDF — malware analysis report

Static analysis result for SHA-256 352291ea7a8e6be7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 21:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 17833c59a6a821077cad9a3b90eb169a SHA-1: 1b6b5739171a72eb85a5040a085a25b24619f3aa SHA-256: 352291ea7a8e6be7a41063b9d55514567c1a8640980e9bc06f4ecd7d1c0f66f1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://agrobud.net/uploaded/file/kimezoxoludifilitixivetu.pdf In PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/bixixowofibijitebedasew.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/30050004099.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/sowimipabodeluxemupafuke.pdfIn PDF document text
    • https://digireg.ru/upload/86742901887.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/92242453627.pdfIn PDF document text
    • https://birotex.rs/images/files/dekizuvubibopet.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/49316299985.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/33972659314.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/66146694661.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/21069081719.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/numimedisubaw.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/18056153696.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/denija.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/gawaremoxemo.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/27726163244.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/24636495232.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/difabalupinonosij.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/37017762005.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/lizatitinovuwukamaz.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jixezeguwanurefitur.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/87259349756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=life+after+offline+mod+apkPDF 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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 10540 bytes
SHA-256: 8155e3d4dcef8c3a61808a113c35e362f0bc2e6273afccce830200af5c3df871
font_02_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 18176 bytes
SHA-256: 032ec8be167d81c06379cf89f0970a52d75aa58f5b63d895d124c853fcd87bb2