Malicious PDF — malware analysis report

Static analysis result for SHA-256 da07f0292b6a790f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 22:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79eca2c26ff99bdebeb825f9c5b4c472 SHA-1: 26e13165324accb4c10c86d4360ebe4c84186664 SHA-256: da07f0292b6a790f51ebcbb2275377b097284f03e2f119f8e2d3bfbcbdb706ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host a large number of links to other PDF files, suggesting a distribution or phishing campaign. While no scripts were directly extracted, the nature of the link farm and the detection suggests it may serve as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inprovitchile.com/ckfinder/userfiles/files/81007299732.pdf In PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/18227266502.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/90427262532.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/logibonezebanatodo.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/nuzipuzaxipuvoze.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/romosarumavosuvaku.pdfIn PDF document text
    • https://stvorki.ru/files/file/jepapotalasusalubinifijav.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/kotagen.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/76921673278.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/vubimumojojovaxinezabepuk.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/jedudarevududafa.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/80790642866.pdfIn PDF document text
    • https://mavibusiness.it/file/periwuxefe.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/36880656831.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/11701399110.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jetovowasofexudezirigugag.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/22974080396.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/13131010604.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914015047.pdfIn PDF document text
    • http://gnox.vn/upload/files/39444679960.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/suzeda.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/67423895415.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sinofupuki.pdfIn PDF document text
    • https://hujanuang.com/contents/files/lufawamorubatifa.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/xefupuxogefafinesesoxuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fake+gps+pro+downloadPDF 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_off0000af8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 15340 bytes
SHA-256: 63c66d6b370c77468267ddc71864b44d245b1fcb8bc9b4d497401d195d61f690
font_02_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 10532 bytes
SHA-256: 6038bfd84fa5b50ec4651ff8be3597046ec0fde9adc239e4257de4f6f43cb319