Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8db32cdba9dfad…

MALICIOUS

PDF

81.6 KB Created: 2021-10-06 05:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2261b7c196c6a999c569a6e5919974a3 SHA-1: 12ae82a4d942a505f7458867e69cc716e763398c SHA-256: ef8db32cdba9dfad74d9e5cf8fd2a3595aed670485837e230592ebbdca67a5c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on different domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO poisoning or to distribute further malware via the linked PDFs. The embedded JavaScript is likely used to facilitate the redirection or download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://fabriquetextil.com/js/new/fckeditor/userfiles/file/92888098446.pdf
    • http://anpo.vn/upload/files/bazidolulidefu.pdf
    • http://unite-chem.cn/upload/files/bojemurunorudujapirupi.pdf
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/muwanonudokesevazoroko.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/jaminunonevojefuw.pdf
    • http://theprofitnesstrainers.com/userfiles/file/dimokejabukatumaxa.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/didawew.pdf
    • https://archicakedesign.com/upload/file/gobomugejapepuk.pdf
    • https://pinyardim.com/calisma2/files/uploads/79982804830.pdf
    • https://netiko.ge/img/Data/file/9393118318.pdf
    • https://parc-hotel.info/file/wunifivaxenilezedizali.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///30900200480.pdf
    • http://uchid.com/uploads/file/metowulopavijatuxixiz.pdf
    • http://bartuceviri.com/userfiles/file/rivuwafogipiganujizonesu.pdf
    • http://phupmirpol.pl/userfiles/file/sisirefasigetexiluv.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89233486287.pdf
    • http://soft-pro.hr/upload/datoteke/tiviwej.pdf
    • https://usgcambodia.com/userfiles/file/xafepuxola.pdf
    • http://robbes.nl/media/files/favulizanes.pdf
    • http://srcchaika.ru/files/uploads/files/58731777747.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/rukotapakajarorakifo.pdf
    • http://freeware-software-download.de/uploads/editor/file/tigesa.pdf
    • http://www.pzkexie.com/up_files/file/24178091021.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=call+of+duty+ww2+local+co+op+campaign
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42e.bin
58d409f7ffe5175cd0ca616e8f123c85dacab34b9afe9a2dddb136ab27d35e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 19276 bytes
font_01_sfnt_off0001079f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 16792 bytes
font_02_sfnt_off00011fb6.bin
b4d110ae6e685032ed6125bc723aae98c78de12f40784c813626161e7664f547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 11012 bytes

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