Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7874e0db4135ebf…

MALICIOUS

PDF

88.0 KB Created: 2021-01-06 03:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5c23d5385239d595120971a98f8eaa99 SHA-1: 50d36e0fd1c1bb590870df8ef2a513af04468f1c SHA-256: a7874e0db4135ebf6c60159a815689fe366e0ab340a32f7a24b3b1a481c652a9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of unknown reputation URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure itself is designed to redirect users to external content.

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://traffking.ru/123?utm_term=hendley+elementary+school+shooting PDF link annotation
    • https://kufaxalerix.weebly.com/uploads/1/3/1/4/131453821/luzevomu-pevifovifokode.pdfIn PDF document text
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/ef1a3e7b56e.pdfIn PDF document text
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/gazuvepizil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_5fbb8a134d1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_5fe7455ca9a61.pdfIn PDF document text
    • https://rujibuteza.weebly.com/uploads/1/3/5/3/135308743/7062626.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/d3aa2187-4bd8-4277-b569-77ffd2584d60/heart_block_quilting_patterns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2b055b-6291-4a0c-b2cf-67bd92bb55c0/exerccios_sobre_movimento_circular_uniforme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0e2bdb-a8b6-4a25-9381-f6034b497568/teligarukugevaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ae82ed-d31e-4409-aacb-ca4a62ce7a8e/graffiti_paint_vr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a317ebea-9d40-495b-a70b-060fa768a979/61843296190.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 16412 bytes
SHA-256: 682d2f0b3e2e1a0e1c4d925c4fa9071f082bfecdd34b6b7d54912dc964ef265d
font_01_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 5416 bytes
SHA-256: 8573d33b7de9d509127e31f387407eefcf95410f06a09c30abc9b3a64d938d50
font_02_sfnt_off00012c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 12228 bytes
SHA-256: 42ffb8d01d39cc4f6ec0c2e41bc75860dde89638f01c02bb18c7e5d42bdee33f

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