Malicious PDF — malware analysis report

Static analysis result for SHA-256 278763dbc052d6a9…

MALICIOUS

PDF

71.6 KB Created: 2020-11-20 19:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fe2037285bb1feea5378e64ec8f6f888 SHA-1: 2c7ac65023d391c63269c3977b4012117b590f62 SHA-256: 278763dbc052d6a9481bc9ac875e297bb6588ed44a5e05259e682b63e6719038
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, masquerading as a school bell schedule, which is a common phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=spanish+springs+high+school+bell+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f9a8e9368cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f90897dbbe1d.pdfIn PDF document text
    • https://nulivoji.weebly.com/uploads/1/3/4/3/134343303/9aea1bd98d548b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f8b237c63b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_5fafb6f896e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fa1ce5f293b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f96d94469ced.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/kavisawudufome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ee440d-3bb2-473f-8c41-987f802f7860/walgreens_south_florida_ave_lakeland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaabf516-fdd9-414c-a8c2-b2fdc0c5b9ac/manifiesto_de_primo_de_rivera_coment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893b388c-c801-47ba-95f6-b545dd940cd3/supuxorupuwovopum.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/resume_latex_template_mit.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/powobonoxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b3340d-5772-469e-b47a-84fd06d7bcd7/54535530585.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_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 5580 bytes
SHA-256: 35574d52a20dc5f429931d4feee30f75e4286a1e577459772a923b402498cf69
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 2056 bytes
SHA-256: b879c8d30c39ec211a569029ebed560f3bc343927d0508be1bb221cd5e1512a9
font_02_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 11244 bytes
SHA-256: cccfa0688e8a91acd6673a661f882185d3cafda52188272f641b118418e0813d

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