Malicious PDF — malware analysis report

Static analysis result for SHA-256 4314c85c9f3cb2e5…

MALICIOUS

PDF

76.9 KB Created: 2021-03-26 02:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44e9c18611ddb9b1b8cfbbc9f97d92d2 SHA-1: 1267bc661a2d8bb79895a08110ee60f195d8d0f2 SHA-256: 4314c85c9f3cb2e57326ab73b975b3fc88033b85ffcdf2dd381dc0b6494b9d4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a phishing or malware distribution attempt. The file contains a large number of external links, including one pointing to 'jacksth.ru', suggesting it's part of a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs strongly suggest an attempt to redirect the user to malicious content, likely leveraging embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=yeast+infection+home+remedies+yahoo+answers
    • http://wiinorama.fun/ouz_atay_eserleriskgun.pdf
    • http://alkostore.xyz/buvubinutiwiworuyaa5.pdf
    • http://gazzsheff.xyz/media_markt_gutschein_online_einlosen_geht_nichto7ms0.pdf
    • https://cdn.sqhk.co/vowibesep/Eicjigf/durinomejizipujugavuferu.pdf
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5ff45c8b52934.pdf
    • https://cdn.sqhk.co/mipijotom/IjcadWW/freeway_closures_southern_california_today.pdf
    • https://static.s123-cdn-static.com/uploads/4490735/normal_5fe323e670d71.pdf
    • http://slimerecipe.org/zexijowowanojelifakqtt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_4ae98dd2594444c7b1021c41af871f00.pdf?index=true
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_3efc3aa0b5af471696282778d0e15455.pdf?index=true
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_100c64398d1747f0827d1bd225d8d165.pdf?index=true
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_73900bbd63ff44b98290328a2280ff14.pdf?index=true
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_39090afabe57429aaa48af3bf0ee5b74.pdf?index=true
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_9978cea8ad4a487cba15e972d3070ba0.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_84a4af2ebbdb41f0acf1fe0263cc3fb9.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_4d4681c84bad453586092fbb01387a65.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_144dbd6bb32e47039c4353233d6ec4f7.pdf?index=true
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_187550c508de407ab187490176d30158.pdf?index=true
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_71ced8dcd08f489aa34ad3ad056030b5.pdf?index=true
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_335107094b53404cbd41c7b3cd64d76d.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1db.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 2900 bytes
font_01_sfnt_off0000ec1e.bin
5196e00ac87458cac19ff49dc29dc94da785b0b623c298385bcba8f4683cd0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 5384 bytes
font_02_sfnt_off0000fe56.bin
3253aac275399cb21439b78f6aa87fc2ea37b4b216747db99fab939eb3109206		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 12520 bytes

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