Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f1ac9b69feb377…

MALICIOUS

PDF

70.7 KB Created: 2021-01-03 05:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 962005e02cde641f155f9df7d415d0a5 SHA-1: dc85f3345419211d80d1dd3b291431c72979203f SHA-256: b9f1ac9b69feb3778ff55536baf58e590ee3c58727f33e64986255666e633719
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a phishing or scam operation. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious or unwanted content, likely for financial gain or to distribute further malware. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

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/123?utm_term=jio+tune+old+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fe90334e3c7b.pdfIn PDF document text
    • https://zodajuxos.weebly.com/uploads/1/3/4/2/134235393/2206715.pdfIn PDF document text
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/4709581.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/54a19390-dec5-4b59-9c67-c1338dcf3f48/gta_4_psp_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec78a1b-cb93-4927-982e-b969caf3fc44/dibovamoduje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767f4240-3748-4f44-ad79-a17634188d48/movie_creator_free_video_editor_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdf377d-98b2-4326-8ac7-e6f9bc4d867d/68035616424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41cbc2c-ac3e-410b-b708-3ddc0e0df997/minecraft_unblocked_school_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/95354336828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b64c7b83-6307-4c38-b201-2bb53f1676a4/thoroughly_in_spanish_language.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/43563947953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fec7c81-bb16-4725-9ea2-d34a98ff3bd8/mugemesovobatudidikusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786b50ab-07d2-498e-a777-8b79688e1f29/45179393498.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 4732 bytes
SHA-256: 46fd67a8486303ea7b874ea2ca8a8f8ddd401efc43359324dc0d9e37b25197d4
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 10508 bytes
SHA-256: 8540249ad465330ea4df0e869e43a5ca8f5db5cb714fbddf1a774511d89d3c38

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