Malicious PDF — malware analysis report

Static analysis result for SHA-256 581b0dda4e6f1c82…

MALICIOUS

PDF

76.3 KB Created: 2021-04-26 00:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7d7f2079e20310aa831dc825fa679a1a SHA-1: b1eb7f1b0fd723b8a8fe9b2a2346083416255610 SHA-256: 581b0dda4e6f1c8263336d37622792b9fe2a653364beb90012474989ab288dc8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to harmful content.

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://midufefew.ru/strik?utm_term=thirteen+reasons+why+season+4+trailer PDF link annotation
    • https://xuwomiber.weebly.com/uploads/1/3/0/9/130969046/9dfc8137.pdfIn PDF document text
    • http://copyrightproblem.com/fogezokupakegikajav7nird.pdfIn PDF document text
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/3819623.pdfIn PDF document text
    • https://xokufilamiv.weebly.com/uploads/1/3/1/4/131437438/wizijotetuzaw.pdfIn PDF document text
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/538004.pdfIn PDF document text
    • http://alcexpress3.xyz/957515670677xktj.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/xunilukegez/ringtones_for_samsung_note_8.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_9c55943e251f4f6487fdb413e4e56914.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisute/burkholderia_glumae.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/78166755091.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/velamamawe.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/cancion_catolica_saber_que_vendras_letra.pdfIn PDF document text
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_9f8b021d22314b2c8594e054b0b76990.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_1a37244d0ef04bc68d449b81106a0dcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/51811646793.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/acid_base_and_salt_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/29975305467.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_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 5004 bytes
SHA-256: 382c12f34f385445e1c9e13b6b5ca71ebbd05f5ddbb1cda4842ac04473f7b5e8
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10888 bytes
SHA-256: b389da0a1a674caa872e53028b1e3143eb3cc1494569f55202cf20cb8fb1f4c6

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