Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1815719f0ec111…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 03:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ca00ce9eb0ca9821fda599cf581e35f SHA-1: 6b71a403be70a5146bf88ebc84670ed3f339ed6c SHA-256: 1e1815719f0ec1112e003bac84fcf4a6e13f027a2b54df78a095929013ecfa6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are consistent with spearphishing attachments used to redirect victims to malicious 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://refpecsbelvaros.hu/kepek/files/vobewijusibesaxineko.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613938243f713---37525766866.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/50402845347.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199327239013.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/49974995907.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/lomoxawutifetomisuta.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/22124189594.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630558181_adfd47d574.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/filamakilorusivulubolid.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/10515776051.pdfIn PDF document text
    • https://megashina24.ru/files/files/62975860741.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/60281232388.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/vetewovorixet.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/67145983252.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/78321724750.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/pikefupekiwibolisaguxiron.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901161905933686.pdfIn PDF document text
    • http://chamdure.com/DATA/files/91274226104.pdfIn PDF document text
    • http://clerus.hu/files/file/fazowusutaru.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/xomopadurexelanokolipewil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307dd783d7e---12044578008.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/8506646801.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/veseb.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/62054839507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=data+structures+and+algorithms+using+c%23+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_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 10920 bytes
SHA-256: 34173d62c9b228ba3a4d931b4f29025a91bdae33cd6ed7ab0366328585a2b9a6
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 17844 bytes
SHA-256: 6d0f820ec9f3a485aba5a606099bb68ee86bd8517e2bfe5ac0d50ed05f8f235e