Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5c5d983004271a…

MALICIOUS

PDF

86.4 KB Created: 2021-02-19 11:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7142ffc34e3b133fe0f27d2af7e690c SHA-1: 2082745653a6cb4d1055bc4b9ba9a0dc9513cd78 SHA-256: 9e5c5d983004271a5e280114ac529c9625c16586777983d51de10e68fb633f63
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the embedded URL and the nature of the heuristics strongly suggest a phishing attempt designed to redirect the user to a malicious site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=los+juegos+del+hambre+personaje+principal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_600aac5f23a96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5ff493a90cdba.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/drjgOZ0/vapeditunaloxotonod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_60270b7cc3fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60244d866afa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_5fd0aa9453bc2.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/fjcUif5/wexokikatezogepig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5fe1c8241d772.pdfIn PDF document text
    • http://dkblogin-de.com/dudezavitesale8k5pm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd63b9bc5a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487409/normal_5fcca2c710561.pdfIn PDF document text
    • https://cdn.sqhk.co/nafolekuge/V2Adg1H/first_aid_beauty_eye_cream_retinol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5feb881eb49bc.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/ajjS134/guess_the_movie_with_emojis_bollywood.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/zuguvoxoki/autorun._exe_sysinternals.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_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 5644 bytes
SHA-256: bfbd1890f050e1f3e71272e8b00e463e92be82549f728e81f3d5cec445f98ab3
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 11300 bytes
SHA-256: 54e5a86d534cbf5863950893910091e9f6736a9258aa9cb28f07084a4e5d7119

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