Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1d8e3801b5c170…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 11:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea9e623b2955ae98ebbac3e719d2a5f2 SHA-1: c968015b1bfb95f9edefe08169cafd077b27696a SHA-256: 1d1d8e3801b5c170ffd7bb5fa2fd769c12f86ec74cb2569a982ee6b4fac56892
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=new+pubg+mobile+lite+apk+download PDF link annotation
    • https://rotitelor.com/contents/files/58039289615.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/52397083898.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/gewuvejepagevezuwigima.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/28631721438.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/1449705980.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/91918785525.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/63266701150.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/31536942768.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/nelidisonebonawilexazija.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/60052976566.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630704721.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mofidovijapedafobedaxud.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/69452346849.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/22227511427.pdfIn PDF document text
    • http://superazs.ru/images/news/file/mawedevibile.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/kodinawatur.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/34440471090.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/57639706702.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139677e6908a---sotimagev.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/89967386129.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/31680241769.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/51192253622.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/poretozojuxewabu.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/20712532883.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/5750910995.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/be21c9fbe41756d91414bc7ffd8a8d3b/jasodewipi.pdfIn PDF document text
    • 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_off0000c7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 10864 bytes
SHA-256: b54f0ce49321a6eadcb070cdfe047e2c8f4cdb0effd8a808aab9e22d3a26294a
font_01_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 19296 bytes
SHA-256: fff5b7ef39e19482fa89cc0e0b7db95fc61b7fd516269dc561e692b33bf2f944