Malicious PDF — malware analysis report

Static analysis result for SHA-256 184994cce3c9e398…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 05:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dcb50d975db4cd7784246ade3b29f9fb SHA-1: 08328687d297a8271c1bf4e3ca4caf0872cfadef SHA-256: 184994cce3c9e398a334169cbe8fbc2d2ba4adb6134c1e9dd7046b3018a13378
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URL 'https://soxebez.ru/strik?utm_term=lg+55lb5900+flickering+screen' further supports the lure of technical support or search result content. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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 https://soxebez.ru/strik?utm_term=lg+55lb5900+flickering+screen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369160/normal_6015fdd6665ad.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/36557706482.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/gajonetazexaxixa.pdfIn PDF document text
    • http://jusotupiz.iblogger.org/literature_circle_questions_high_school.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_60065bea666c5.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/9242012.pdfIn PDF document text
    • http://betawajapasex.22web.org/atmosfera_zanichelli.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/jawugutunanegasixigufum.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/36ed91fc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78830427-64fd-466b-b7ec-2fba474a686f/98754340479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce51f220-55fc-4986-b868-86e168ccc7b7/musowozobekevad.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/17508194868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada5ad24-0b72-4fe3-bca8-c714d004461d/8603594806.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/32059655988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4736bb73-8ff0-4a24-a4c7-46042f4eedab/35562021495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10edec1-65a8-444f-b941-0d5ab5c5852e/what_do_the_buttons_on_jbl_flip_4_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/kendo_spreadsheet_validation.pdfIn PDF document text
    • http://kizawudeto.rf.gd/807b01f4_error_xbox_360.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/what_are_the_5_principles_of_communication_privacy_management_theory.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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 5404 bytes
SHA-256: 801419d5f275c1be45f8f60b44224d690baddf8f143283070fdae90a94a061f3
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 11208 bytes
SHA-256: 89b0852b59c09b7f7c19eed7e1bb5b06f28b547d14f58c4f3b4dedbe55c972b0

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