Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee694aba6be1ec1…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 08:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a8a4e3d6b6ed41fecce6e3fa1f4c3c04 SHA-1: 3264e51279a8063efbbf266344d703256fc3a0de SHA-256: 9ee694aba6be1ec1a7f34dd6953b7afa66ee6e2fb863b8bc42b533b99ba597c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted for duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sxhk365.com/uploads/file///jebenoxezazebatapi.pdf In PDF document text
    • http://asude.istanbul/ck_images/files/62395463487.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zevelasuxalikagulokuk.pdfIn PDF document text
    • https://digiconelectronics.com/media/95880956340.pdfIn PDF document text
    • http://chieucoingason.vn/files/19197308168.pdfIn PDF document text
    • https://fond.ru/userfiles/file/30862302968.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/wanaregodevurakaga.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/teges.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nefopupugiwozijezuve.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/59562985747.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/xexijiva.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/fuvitijolenawipadawotevo.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/mifasexamuxikeratedalaju.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38993f9d7---88187044180.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nalix.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/93090165190.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/bajapejamipugekat.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/dekuleveguxo.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/56212315040.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/wedasoxad.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nomisunugufafa.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kd2qo9a5vdap3gcqhb3igbmjqh/buxababaruxupulogur.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/dibugagabagupetegatiwele.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/45674977777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cast+screen+from+mobile+to+laptopPDF 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_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 16520 bytes
SHA-256: 6eab325997f502132b766f86ddebef2781c565860d1eae7eb40ef2f697eba4d7
font_01_sfnt_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10812 bytes
SHA-256: 930784340c40e658f9b4ebc30e3202e988ac2ea00ab3addf7e2c0ce363c839bb

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