Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74d2f05a0a66ba5…

MALICIOUS

PDF

73.2 KB Created: 2021-10-03 09:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d1501c42e4d1e04b5fb6c68ca7a27123 SHA-1: 9c13fa1496920aba384cb44dc577a03e2b33fe21 SHA-256: c74d2f05a0a66ba5de7508091f1dc5dc097d2d03a7f5dc946835d5c2775b913d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content or download further stages. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=ny+14th+district PDF link annotation
    • http://golfvillageonline.com/userfiles/file/tibemubojetamidepit.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/51417496162.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5uj1rauhtop96r87bue6fulgn5/ralixivakidivez.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jomav.pdfIn PDF document text
    • https://arendic.cl/files/31971605885.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/71865751738.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/fawalab.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/18154216553.pdfIn PDF document text
    • http://nature-revive.org/files/file/rumajez.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/22741643216.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/nawikidisorakarezido.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/75345466300.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/zalomuw.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/89987295955.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/wusufonuxor.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/giwedepuwigunidefe.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/5378777633.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f05c8bf0b8064c393c212a91368a5def/84591647948.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/61253205729.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levikaturade.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/bosozimubiwifowasu.pdfIn PDF document text
    • http://cl-pub.com/files/files/19392793923.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/7887469922.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/dalejoboxibigebopureroxop.pdfIn PDF document text
    • http://wernitznigg.at/files/tovumas.pdfIn PDF document text
    • 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_off0000b6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DE 10124 bytes
SHA-256: df673948f04d9fd76573dd2124fe657c20f5aeeb6b67b693ddc7d8cc7ded3f12
font_01_sfnt_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 19660 bytes
SHA-256: a2e0d7e2c1d28c0b6f6a1dff38f23b0724ff1f5bfa6bff2c76aa593ea6c8185d