Malicious PDF — malware analysis report

Static analysis result for SHA-256 beec4d4b081c990a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 08:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 321b4996fe3612664f03a6251767cdf3 SHA-1: 3fd33361bcddbef6ce85e3a26efad0dfb69ba68e SHA-256: beec4d4b081c990add35f3881dcdc44503818c8b67a0bb4bdc1d715d0095f4b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/20603291438.pdf In PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/15386321219.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/29021933657.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/gejeg.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48c8e7855---jikinawewurifubozef.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/72913600075.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/92858776742.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/wukexoxupemejufef.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/93414081421.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/52128761860.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109211028058438.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pomexokivobot.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/76829817165.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/43640925181.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/sewafuzotilawoxip.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/36853712746.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/54023073360.pdfIn PDF document text
    • https://nistd.in/userfiles/file/sunupuxel.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/55717318795.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/sujikedagavomupegezefimom.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/wuzomewebudadelegapi.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/pajafalevekeretizawak.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/54119821e49747642269ebec5f91eac7/xewawulaxafebaredezol.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/jerib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+train+your+dragon+mod+apkPDF 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_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10772 bytes
SHA-256: 9cd5f4182286c489775494baf4931ebc1e0b43ed4395be8da4793c62847b383d
font_02_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 18972 bytes
SHA-256: ba47fb1534826ae619f3b67834bc5eb3ba442978eb9ff22e7244accc7f1621b7