Malicious PDF — malware analysis report

Static analysis result for SHA-256 19909e0526cf691a…

MALICIOUS

PDF

70.3 KB Created: 2021-04-04 21:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d7cc97422cf25fd6c30ebfc3b588ab17 SHA-1: 93357a038d2c453b197939961d29c9740a0b60dc SHA-256: 19909e0526cf691ae99854dca97bc53816f276ed82737c7da9e6c087f901f4d5
226 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update, a common social engineering tactic. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • 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://dugedepap.ru/strik?utm_term=cisco+4742hdc+spectrum PDF link annotation
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/9491026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_6037693ae9016.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/7934c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_602d8b48afdd9.pdfIn PDF document text
    • https://tobapedez.weebly.com/uploads/1/3/5/3/135344168/xupupubopevatumulu.pdfIn PDF document text
    • http://muruxilirafet.iblogger.org/wazatejilanazak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fd7184e34f8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496146/normal_5ff132f7f0042.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/9b46ab2d-9773-4847-b87a-0d2e06d64d2b/depowufegosa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/dicionario_aulete_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d5b0c5-4804-468e-aa3e-a43ea6d60303/kozezazojeletoxekapudozu.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_369fe846ee2a4f8db72bf70ec9ef9645.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/hmdx_street_mini_instructions.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_a681957ec66f48839844e9858eaf1b71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a471328b-42a9-4342-a42c-24e614ba8c40/5882355939.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/jigijudopozabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77288e91-0c58-4222-b91d-edc79480cf47/2004_ford_6.0_diesel_oil_type.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/zigodilawedi.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_2ab01218851e4d908c853414684e9da4.pdf?index=trueIn PDF document text
    • http://femavumifixomud.rf.gd/network_marketing_scripts.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_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 5276 bytes
SHA-256: bef1eebd4a47243cf96546ae7a13c8baee7eeaca2259c60addb5674ffe76f295
font_01_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 10644 bytes
SHA-256: 40c5837510bd78a0a5c25ca2cdd946c7f440bec7596568a9f9fc547543f1c6f0