Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaa7484efaeb832…

MALICIOUS

PDF

67.8 KB Created: 2020-12-18 23:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b01ba5dc6369e1af431e3eaca6ecff29 SHA-1: 041ece381d5ea19f7370e3cd26d8e9b1c6e50bd7 SHA-256: aeaa7484efaeb832594f575495482c69f8b73563210ccf44eaaa0d2009781b40
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 external links, many pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://traffking.ru/strik?utm_term=example+of+positive+reinforcement+in+school', which is likely used to distribute malware or phish for credentials. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://traffking.ru/strik?utm_term=example+of+positive+reinforcement+in+school PDF link annotation
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/petigum-bolumamebibif-vodezopij.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/paxolujek.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/8e46aaa8-2c4c-4e7c-b80d-a1798b501eec/97374349072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65254eb2-a6c2-4a6b-b4b6-93023a4b0345/rca_gemstar_guide_plus_universal_rem.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/kolhan_university_part_2_marksheet_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd75c7c5-760f-4b61-9898-17cb35db674c/fowaxetepajumogonunu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13b47c14dfd36fef3b64a/t/5fc3c367f8cdb769c6564277/1606665069916/webavepawipipegowif.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/tidiviwiduvexigo.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/89524228716.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/54946705674.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/ron_brown_scholar_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e037c72e-ffa9-4d32-b7d3-b9d7907b94c2/15140215977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba4b458-dca1-4e30-8af2-35de78013702/65248212795.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/57797680313.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_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 5340 bytes
SHA-256: ae26809bcfbbf512aee3ad5e882937ea3b08d063fbab77388af7090e7e1d50bc
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 9976 bytes
SHA-256: d96329b84f8dbc9a1ce6f1c5cf90f8a6fa7c37b3126f1d2a9ab0c7ced412b485

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