Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0bde8314291123…

MALICIOUS

PDF

69.7 KB Created: 2020-11-14 04:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9f053d92ab56e46e40a581c455602947 SHA-1: 5fb3345df802f6c1f845ca65247a57b8cd77b828 SHA-256: dc0bde83142911239102e9f0c751a7038d14b71aac370577ed283ee018bc4450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on Weebly, suggesting a link farm designed to redirect users to malicious sites. The embedded content, though obfuscated, appears to be part of a lure related to 'couchbase lite android'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=couchbase+lite+android PDF link annotation
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/4158573.pdfIn PDF document text
    • https://mazazogadof.weebly.com/uploads/1/3/4/3/134374066/nojerivomow.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/6278248.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/3efb16b5-f3eb-4e01-a66b-0236293e5763/96559301431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e826b891-ef01-4d70-b8bf-337c3fc64081/edready_math_placement_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8da6971-cc2c-427f-b952-b424446a6d7b/bamepumoduzafekobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03fdc19-9807-45eb-848a-57eb377f1bbb/bovivivamirukuwopeguketo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17136ca7-4c8c-4c01-a51f-f29c73aa5dbb/digabinetegugiviwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f21006-1ae3-4572-86eb-b0f0e385b204/7686010508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738cfa74-2eb3-4b74-b665-a78729506987/beadwork_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c195e3-fc3c-4a12-bbb3-7e260c6810ab/89755282998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda27f0a-2e34-4ef5-8c5c-3a25ac1cd061/76245248661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a394485e-009b-4684-9213-63c98a7b4c38/73060243365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1921a845-23d5-489d-ae6e-9c2f28a44cba/mazali.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_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 5072 bytes
SHA-256: 56276b072b9b99f935d161442ab1f0e462ceb9bcafeedcd61073d6a5e24d184e
font_01_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 12912 bytes
SHA-256: 73ff8d454f0171dbca2c6090c2c2e27dbc50879b4d1a23f9334ee4bd8c15500a

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