Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4816b6e2f772f2…

MALICIOUS

PDF

97.4 KB Created: 2021-03-24 21:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88138fe12f4b14f5d8ebccd9e79aee21 SHA-1: 75c1733050e709c8fb907508fefbc2b365685920 SHA-256: 4e4816b6e2f772f25102d707cac97b0db8c596fdf3553357957474fbc9ba5d15
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or distribute further malicious content. The document body, though partially corrupted, contains keywords related to 'negative effects of thunderstorms' and authoring information, likely a lure to disguise its malicious intent. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=negative+effects+of+thunderstorms
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/d7beaa.pdf
    • https://cdn.sqhk.co/nuxowilag/eDgcihJ/winrar_archiver_windows_10.pdf
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fcda63a54c51.pdf
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/mumot.pdf
    • https://static.s123-cdn-static.com/uploads/4452607/normal_60092a7a7940a.pdf
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/nolosomeko.pdf
    • https://cdn.sqhk.co/daxerarugak/djc96ij/free_html_templates_for_inventory_management_system.pdf
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ffa585647af4.pdf
    • https://sobopagep.weebly.com/uploads/1/3/0/8/130873740/9776083.pdf
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5fdd97aedac67.pdf
    • http://ninolafe.22web.org/69250612835.pdf
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/puvopunarupi.pdf
    • https://cdn.sqhk.co/fopikudapom/chsyK9T/edmodo_class_code_list.pdf
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fc68194d21cd.pdf
    • https://cdn-cms.f-static.net/uploads/4494888/normal_604bb9f96e0a7.pdf
    • https://cdn-cms.f-static.net/uploads/4366350/normal_601a3b5fd8905.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_e8c8bb8a87dd44cdb50317a7ff3623d9.pdf?index=true
    • http://somizifiwij.epizy.com/face_recognition_system_ppt_free.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_7bef55f5e7d34e0b9d65167d3ce370b5.pdf?index=true
    • http://watenumedar.rf.gd/55690196214.pdf
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_f774199b632c4078ba3bdaf7fa1bb363.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_6cb72dea70a54e508dfe159f2ce6a45d.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_off000134e8.bin
d8d8a5b5e07e5063a6ce4c7253a274ea73a0a22b32c7f94910fc2f374269c5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E8 5432 bytes
font_01_sfnt_off0001474a.bin
8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1474A 2116 bytes
font_02_sfnt_off000150f2.bin
b127ef92926827638fbb03fa2139bb1da68123c8159ce1a7a7f48a45d2ee4e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150F2 11396 bytes

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