Malicious PDF — malware analysis report

Static analysis result for SHA-256 b881fe83d8443618…

MALICIOUS

PDF

72.1 KB Created: 2020-12-10 09:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6cf76ce3b2ccd0854e96aa1b936a116 SHA-1: 5c3743fd302a2d2f4748cf13fd4809cbfb7a921d SHA-256: b881fe83d8443618a8b203c42c60380053ab316dd9c04c320b7148524448704e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, pointing towards a potential SEO manipulation or phishing scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful sites.

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-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://trafficel.ru/123?utm_term=manual+drinking+water+pump+home+depot
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/vupav_wasot.pdf
    • https://static.s123-cdn-static.com/uploads/4413456/normal_5fc70d7a16e6e.pdf
    • https://xuvuluvibes.weebly.com/uploads/1/3/4/4/134494650/duvijuwijeza-xitivibilopupi.pdf
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/kopepujo-gajatu.pdf
    • https://nebijuwako.weebly.com/uploads/1/3/4/3/134376342/lewab_vazobugu_mumosoxaxer.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/5234630.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6c5477f1-893d-467f-8aaf-255329c16d35/laremajevutefesepot.pdf
    • https://uploads.strikinglycdn.com/files/e82fe33f-f72a-4113-be73-7572f54a7312/xatofawokegexipemewub.pdf
    • https://uploads.strikinglycdn.com/files/0b425810-ec32-4e89-a5e4-f387cd738939/gubugeteponadot.pdf
    • https://uploads.strikinglycdn.com/files/44aa68ba-61ce-4f1e-9326-9fb00cf57102/wufine.pdf
    • https://uploads.strikinglycdn.com/files/7eb875dc-0217-415f-9059-01a5a316ca50/alcohol_to_aldehyde_pcc.pdf
    • https://uploads.strikinglycdn.com/files/c9d02564-14e4-4977-baca-d07850cdf5ec/sexisogat.pdf
    • https://uploads.strikinglycdn.com/files/c60c6487-2660-4532-b48e-5ba07ab9c29f/61667167657.pdf
    • https://uploads.strikinglycdn.com/files/3d4aae8b-d936-427c-9f9a-1b15dad54b12/tu_sach_dai_dao_cao_dai.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd93.bin
face6f5d4f9767b38506ca510f3f8da4fc17d783f2080c2c34f9bbd8a9739b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 5356 bytes
font_01_sfnt_off0000efbf.bin
8c500cfd8e55395700a894ce70fec0f496813ae72de1b878fd1bded650e2d49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 10572 bytes

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