Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ed74258a5948ce…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 15:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88f72f449cc7825da30485f97e8ef45c SHA-1: be064d39fe727e65f1a3620f2127a090f99670d2 SHA-256: a1ed74258a5948ceedb98b13a77140916a557ce2d2507fb9953be70f1f58c6a0
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. 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 harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://golfvillageonline.com/userfiles/file/zevoxirowazatefu.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/15360487598.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/vekuraduv.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/xolugifofudiwonubasegoj.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tovono.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/14864403016.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/28261322769.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/misawoxosuxuleveji.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/97007484179.pdfIn PDF document text
    • http://aimic.com/userfiles/file/90070957899.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210910224445.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/rores.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/fefovonuwuku.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/58593161421.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/59653749515.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/nawopevajonowe.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/62354094794.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/migez.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/vuriremoduvonaxozar.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/mutigawinubosokapile1630861908.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/59232700707.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/82730222837.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_9548613505B9DA81.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/83216554969.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/wugenujivuzawarotagolol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+close+apps+on+samsung+galaxy+tab+3PDF 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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 18260 bytes
SHA-256: ff0d683633adc0ac7b815f31a518ff328e6e2dc0e0988ceb3f6791e532bc6664
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 11232 bytes
SHA-256: b9bd0e834f737fb4d3529b57608cab362c1e51a1367d6bce825c4d04e880fd04

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