Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d460c4dc8f93a41…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 12:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0b460e121d35f38e350f2f8e40f8ffac SHA-1: 23c6a794dc87c112376a6e9557e9a5da9e766cdc SHA-256: 7d460c4dc8f93a41d192d8906d2b6351c1476f5523b58b4bca407c379a640289
340 Risk Score

Malware Insights

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

This PDF document exhibits multiple critical heuristics indicating malicious intent, including being flagged by an ML classifier and ClamAV as a phishing trojan. It contains a mass of external links, some pointing to known malicious redirectors, and instructs the user to disable security software and install a browser extension. These social engineering tactics are commonly used to deliver second-stage payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=android+drive+network+error In PDF document text
    • https://niwifexugebap.weebly.com/uploads/1/3/5/3/135316215/161130.pdfIn PDF document text
    • https://wedoweniwan.weebly.com/uploads/1/3/5/3/135308992/popat.pdfIn PDF document text
    • http://towilevelogefok.22web.org/35078177434.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/36495.pdfIn PDF document text
    • https://siduwibe.weebly.com/uploads/1/3/4/7/134775996/jaxerumejugi-kezobog-rofagij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nesuzilusuk.epizy.com/30586232553.pdfIn PDF document text
    • http://mumazidujinodu.epizy.com/marlin_336w_vs_336c_price.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_e5b8c315b6b7438989f151473a857264.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_d5a7628607fd43869e77f26984778d83.pdf?index=trueIn PDF document text
    • http://sesisat.epizy.com/gmetrix_word_practice_test_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/gas_grill_reviews_consumer_reports.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_828d709ef6554e728806e15b398b51e1.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_484d3c55292747b7998330dbe2a228c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/free_wedding_slideshow_template_powerpoint.pdfIn PDF document text
    • http://nuboguvulasof.rf.gd/89869550142.pdfIn PDF document text
    • http://potubavaziripek.epizy.com/hijri_gregorian_calendar_2020.pdfIn PDF document text
    • http://vububogux.epizy.com/xagofuj.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/81067182615.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_8d9886a6354f44b285d869d222632d18.pdf?index=trueIn PDF document text
    • http://xivefasojag.epizy.com/zomolujofututodutoju.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 4604 bytes
SHA-256: 2f20087b1081c6cf6bf5e7d9d4048979ea2316a36a0be6479f3b6697c2650d6f
font_01_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10592 bytes
SHA-256: 899e00ce6c6d0db758f7eab75b8fc4788360012aed50baf55807cde2493fcd40

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