Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5994155d50c19e0…

MALICIOUS

PDF

83.5 KB Created: 2020-12-20 09:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ac1cfd61301e1da44c4a6e255648cb7d SHA-1: ca6c013e23ce7cde09616eb5323d750d0794da71 SHA-256: e5994155d50c19e0fc36ccd73f0ea2262b441d451d404bd28b6a525ed317a359
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 is disguised as information about data modeling interview questions, likely to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect the user to a malicious site, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=data+modeling+interview+questions+for+experienced PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fa850a74cad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f9ec3df6c11d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5faeed719adbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_5fa848bb8a445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fd139282aeef.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/panokojol/datosafeniretidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b042cc-5967-4b46-8169-d5a054a505c3/63555812657.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/34776172292.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9ff03a83d042422c3343/t/5fdd04b067c0292b07827c9c/1608320182247/cubase_5_for_macbook.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5820 bytes
SHA-256: 94ef6439e1f69d8975de042c9cab520b2c0fd76d1377b33b7817b568eba91853
font_02_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 3056 bytes
SHA-256: 45138e12dd7c758ae96d7c4c4263a3b72bb9e8d9941e48c6de0fd7a98e160006
font_03_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 10208 bytes
SHA-256: b09b3499c5ca45ec0db684d13da27d2fa3e4a20529bd8f7657d8d425de8bbb1e
font_04_sfnt_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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