Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b29166614edd310…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 09:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c25fddc3548786540236a04ccd00795 SHA-1: 41530d6c847941878d5d53782abbc1d00ff0e39c SHA-256: 4b29166614edd310ab0aca11492970632442c7a298699f9cceee92abbccd048f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bsa.by/ckfinder/userfiles/files/73787269708.pdf In PDF document text
    • http://www.drivingschool-brno.cz/files/files/xumoradabizamugolizima.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/43720001210.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/31476454509.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/58899868126.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/68302221941.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1bda13b36894fdc268383044e8174a/78660863761.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/1574896161.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/potamafewotegawukomaf.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/45295855281.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/nijusajagonobulijav.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///72138949737.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/gufufenosumidawuxemu.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/2237067824.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/14166149584.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/71816233599.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xowunitemevosa.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/32251157937.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091200511010.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/maverudijuf.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903214246.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/94350949032.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nenewo.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091020525184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ig+hoot+likes+for+instagramPDF 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_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 19940 bytes
SHA-256: 84a78e187a6745bc6b6e6c418798c30663c13548823c6029644d5770c798d315
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 10704 bytes
SHA-256: 60401289d8741146ffb3a24b15f4a347aeee734cf4b402e108458dff4863a462
font_02_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1