Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61525c51587ab4a…

MALICIOUS

PDF

73.5 KB Created: 2021-03-01 04:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 44ee18a03147e0428cb8f822addbde9c SHA-1: 86bc2065dee17fb2fd57174b8fd90fcc7c3f4735 SHA-256: b61525c51587ab4a36a47edc341225acaf0c94fc8970d232ac16daad47cabab0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or link-farm-like services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=6th+grade+homework PDF link annotation
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/230769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372399/normal_5fe4f394219c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5fdd670b3f0b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_602013f8e33d0.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/9248383164.pdfIn PDF document text
    • http://zuxukavatogix.iblogger.org/92253317265.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/af6b078d45556d.pdfIn PDF document text
    • https://kubuvapag.weebly.com/uploads/1/3/0/7/130776206/3c199a2.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/2215376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe61c4f1dd80.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/lobusinibisap_dimunoxodop_powik_gotir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fe5404be8885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/how_to_put_a_zebco_33_back_together.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/xuzuguniteperetomamud.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/93289276691.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_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 5244 bytes
SHA-256: c1ea75be9a1f678a2f89c9f98864366a3db13264c05a82c844dcd306cc39fff6
font_01_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10504 bytes
SHA-256: ea9fbae93efb4efd9baaa2b7449eafa23ab7a6e9c12aac80097b8c0d44b0c71a

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