Malicious PDF — malware analysis report

Static analysis result for SHA-256 90855ca1748cff10…

MALICIOUS

PDF

81.0 KB Created: 2021-04-01 19:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b1e1ada9990990f82337c0f1811effa SHA-1: e5f0a8a9cdc8014acd629e43231cda568f5e8f47 SHA-256: 90855ca1748cff10978e03d8ae2092757ad4c1c800eece2cbd5cbd7fc75387ca
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

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://xezojetit.ru/strik?utm_term=wahls+protocol+breakfast+smoothies
    • https://cdn-cms.f-static.net/uploads/4380883/normal_603f83bcdff48.pdf
    • https://static.s123-cdn-static.com/uploads/4424007/normal_5fcc1c993e846.pdf
    • https://cdn-cms.f-static.net/uploads/4489414/normal_605c97f3dfd86.pdf
    • https://cdn-cms.f-static.net/uploads/4450003/normal_6039a4325dcb5.pdf
    • https://cdn-cms.f-static.net/uploads/4451205/normal_604b9456eaed0.pdf
    • https://cdn-cms.f-static.net/uploads/4476001/normal_6049b2df535ba.pdf
    • https://cdn-cms.f-static.net/uploads/4387244/normal_6038e7d3ab328.pdf
    • https://static.s123-cdn-static.com/uploads/4452853/normal_5ff559067f360.pdf
    • https://cdn-cms.f-static.net/uploads/4459469/normal_60198a337d29e.pdf
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fca2a0ecb69a.pdf
    • https://static.s123-cdn-static.com/uploads/4370285/normal_5fc5dac491a60.pdf
    • https://cdn-cms.f-static.net/uploads/4388596/normal_605841d67df45.pdf
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fce15adc9dcc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/libeganot/altura_photo_flash_manual.pdf
    • https://s3.amazonaws.com/sizadagazagaj/15297500795.pdf
    • https://s3.amazonaws.com/legenapi/27849344278.pdf
    • https://s3.amazonaws.com/didowugorokirug/wolavuxudurakiniv.pdf
    • https://s3.amazonaws.com/fejenijovekozu/68287520101.pdf
    • https://s3.amazonaws.com/kikunojulejuj/cazadores_de_sombras_serie_actores.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f2.bin
8477e848b50beb1d17889cd43440c01e48a426d0357dab372b3fc8eb49bbaf60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5156 bytes
font_01_sfnt_off00010284.bin
8bfe1ccc4c48c4f6649adf4e2f68046a53befd879e832123f3a5aa76eb61555b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 10540 bytes
font_02_sfnt_off000126aa.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 4324 bytes