Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a6da1e2b188c9f…

MALICIOUS

PDF

92.6 KB Created: 2021-09-22 14:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2983fd1c59ecc6a5997d9a757de92b4c SHA-1: cbb10123cd487871ae71593353144f4246a2c1ca SHA-256: 34a6da1e2b188c9ffb29d45fc18559f9381bf5bd6e7bdbdff5979cf4b06460f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The numerous embedded URLs, many pointing to unknown or potentially suspicious domains, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://vistobrasil.net/uploads/file/25919252736.pdf In PDF document text
    • http://kindergartenhelden.at/upload/file/jozorevuvovep.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/xakinomebusoni.pdfIn PDF document text
    • https://scalper.ir/data/files/file/33929143901.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40cc3166b---leselemogu.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/puroweziwaxa.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2df5b2b38a1ad70b04d93093322f91d0/66904829978.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/64311004810.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/75817520566.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/71585214484.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wuguwaxiwal.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/30600600431.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/94391403090.pdfIn PDF document text
    • http://www.og2c.com/images/file/bubub.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/rezikugoxiz.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/13079261576.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/57698349557.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/401395579.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/vituranevuga.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/60500532514.pdfIn PDF document text
    • https://network-italia.com/file/94858736352.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/jumobu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/rimixatedijijajonati.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/30201543107.pdfIn PDF document text
    • http://philboyd.com/11071067882.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/rotalaxatikudalapavif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=g+words+filipinoPDF 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_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 10224 bytes
SHA-256: dd07ec61332c5ca9c02cbe38654c6cd818ea8194320bf9931f17f9533003cec1
font_02_sfnt_off00012aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 22640 bytes
SHA-256: fb2e625264dae47ed6f8e43ee15f38c0a479d14b9ae51992b77fde8b978f2ab7