Malicious PDF — malware analysis report

Static analysis result for SHA-256 4070ae03807d5fe3…

MALICIOUS

PDF

80.4 KB Created: 2021-02-28 17:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d96e439fabe6ec6d50085979a4711bc1 SHA-1: fa0480b0f34ca179488f3f95546aabc65a51c2ed SHA-256: 4070ae03807d5fe345cf9d785ae221f3b9fdc8537d7cf34619108f955113c58f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs point to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=css+secrets+pdf PDF link annotation
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/burawo_nunoxenu_rutemarerele_kilodikemuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_5fdb807d06f31.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/91511026907.pdfIn PDF document text
    • http://sowanavatovil.22web.org/56105786937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_6035aadd555ff.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/8220803.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/fupanabivote/4601248773.pdfIn PDF document text
    • http://delupujak.epizy.com/fikutopenibizifexe.pdfIn PDF document text
    • http://gebejofokim.rf.gd/ge_proficy_timers.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/xodigateziriviko.pdfIn PDF document text
    • http://siwojanapav.epizy.com/antepartum_risk_assessment_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 4812 bytes
SHA-256: 0f3ac3f0026b81137c34aa04f6e5903f9217c7c33ce8fa25e32471d33e75b862
font_01_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 11596 bytes
SHA-256: 11c6e696de7d562860cf159a963ca2cdf61fa778d1cde235a5c58d611a2fe952
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826

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