Malicious PDF — malware analysis report

Static analysis result for SHA-256 864584137c057de7…

MALICIOUS

PDF

75.4 KB Created: 2021-01-14 22:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8577db72483e905ecb3ddf2a9b8040f7 SHA-1: bf1addb6609275eff9ab30edacb20e0395e30d58 SHA-256: 864584137c057de774545a1d402ee99680b803bfb96cfc45784aac68dab1cd88
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to reference developer tools, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=google+chrome+developer+tools PDF link annotation
    • https://cdn.sqhk.co/momujolo/rjblPic/best_voice_recorder_app_for_iphone_xr.pdfIn PDF document text
    • https://site-1178798.mozfiles.com/files/1178798/ire_blood_memory_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/UnijH68/rewigijupofi.pdfIn PDF document text
    • https://site-1178040.mozfiles.com/files/1178040/wovesikimupowux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_5fa19df430897.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/nawosineromigi/13306436187.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/25783393436.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/diode_circuit_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/reporter_gene_fusion.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/zosuganuwene.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/fogebasevopuzufalebugig.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/2628365892.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/infectious_disease_guidelines_colorado.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/29020978222.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/handbook_of_local_anesthesia_malamed.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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 5368 bytes
SHA-256: f87ad9b45924d37f9cfdc5b4ebf7ac8437051c2720f194ae84ca0a2ca8398fe8
font_01_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 2868 bytes
SHA-256: 6cd58525b65e0bda80d1699830c47ced1c50147ea9214ad4bdc2d79d2e41426c
font_02_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 11880 bytes
SHA-256: d0fe35b05f4ae1498c5e6b78964c2d3c4c69df8c36e1a78710c6202d120f555f

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