Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc26377d9a0a113…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 10:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68afb3002a5d62135c8e9fd714ba93ce SHA-1: ec6e5e97a7efe84f05dc90dcd2d80f4d63dfa735 SHA-256: dbc26377d9a0a11339d81c08c5c8de4c37246d51911b54efef288443ac6f634e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://thietbimaugiao.vn/Images_upload/files/95903370699.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fopcc8jclqjrra4l7ufb0u85h1/87520341119.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/rilimiwexagibik.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/xifezeperisenimijidogelam.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/fuwalojavumafojin.pdfIn PDF document text
    • http://pnalog.ru/images/file/romed.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/wemaxaxebutizovelumagibov.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/xapufejetoputadurozejajef.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/5370529773.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/75604233296.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/23519571439.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/ridokoliremolimaf.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/45040004389.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vidutifov.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/sokuxi.pdfIn PDF document text
    • http://royalgroup.at/tmp/38177533987.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/87197574316.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/mosabegefolet.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/50521837224.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopepu.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/62118552982.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02f473c1c---vafadologa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=28+days+diet+plan+for+weight+loss+pdfPDF 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_off0000b1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 11208 bytes
SHA-256: 26e18b37e8c4fb072ad3e8a9bb4db3457833d8384b99b5bb5fdc361099458749
font_02_sfnt_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 15204 bytes
SHA-256: abe9fa69e7d6ff96b81cb4c76bea2d369853459667042e90e4e0656d10dce0fb

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