Malicious PDF — malware analysis report

Static analysis result for SHA-256 512dc16ac567f528…

MALICIOUS

PDF

67.5 KB Created: 2020-11-29 10:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aa2f356bdcbed70e50e23fb603e43ad1 SHA-1: e7d2da49f1344286b2ea3a2768c5646c91c276e1 SHA-256: 512dc16ac567f52877c07d4c22aedbf10096128bfe75332af20f1258c22f643b
104 Risk Score

Malware Insights

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

The file is a PDF with a high ML classification score and ClamAV detection as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into downloading malware under the guise of a font. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI and the ML/ClamAV detections strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=avenir+medium+font+free++dafont PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449192/normal_5fb4d134ed24c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f89194bdf5a2.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/wejarekariped-relenewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5fa41978a0410.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/kuzasofigiwuzoj-buvifanu-tewobusof-liwakilesepeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_5f9b0e15d5415.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/sepawi/62838281940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e9b308-1991-4a83-bf4b-3e5d7315e6de/go_html_templating.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/kalphite_slayer_task_guide_osrs.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_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 4892 bytes
SHA-256: 8278510e3a81df58a029bcdb407145c6ce387bd804a3c108ad9b0a4bd28461a3
font_01_sfnt_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 10528 bytes
SHA-256: eaba6d7c3f11e2e10946f890e5e126c57de2b32a9bcf80d0595353ae42d11bd4