Malicious PDF — malware analysis report

Static analysis result for SHA-256 e313af28e83cc0b7…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 05:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 341e7750e5ad04b310dab3ebd3f8bb69 SHA-1: f62ff3f98506f37efa2ece850a6314ca94872902 SHA-256: e313af28e83cc0b7e4e7fc7de5db92aa556dbcb6cbf1d37444712a8c48101a35
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'printable modern calligraphy practice sheets pdf free', indicating a social engineering tactic to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=printable+modern+calligraphy+practice+sheets+pdf+free PDF link annotation
    • https://cdn.sqhk.co/migukosodaza/gfWgiij/swath_definition_synonyms.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/iieAWqE/nibuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fc65700b7d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_601307b964d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_6023a2b09dd83.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/sSFlifn/microsoft_launcher_review_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/ifihiby/99785672232.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/d7hfOlw/29220985888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5fcd5b2432bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5fd7d35e39686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5ff0c8cb4416a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_60183df2238f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_60157f054ddde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 5812 bytes
SHA-256: c0555368dae64a5b819bd675d0bebcd1dc267916a528eb2a6d8e8acb7b92ae24
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10236 bytes
SHA-256: 51d7e3e72e0777e490cebbea13d86dd612db3fb2fc3ddeb6fc682b94fed5d9c4