Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fed34d7c5573880…

MALICIOUS

PDF

74.3 KB Created: 2021-02-10 18:12:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01dd281e7c49ddfc277e7ed4a2881cec SHA-1: c509fa17ec3c42a1df47ad62172ffc1e0fed5105 SHA-256: 2fed34d7c5573880b01f4df7ee856de35e8b0346621388d9df0d72401b5f812e
206 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, forming a link farm hosted on disposable domains, which is a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://maypoin.ru/aws?utm_term=python+abstract+base+class+template PDF link annotation
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/706b2432f34a.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/631c07b4ce92dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_6016f5faec2cb.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/hghicSo/faladoxuxunekikemujiti.pdfIn PDF document text
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/kigepinarajirumujir.pdfIn PDF document text
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/bolafiz-pezalabenujub-zejiso.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/iahe4YX/60146041535.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/vUZAjdI/godutijom.pdfIn PDF document text
    • https://neposetami.weebly.com/uploads/1/3/4/6/134691268/tegibured.pdfIn PDF document text
    • https://nivumumati.weebly.com/uploads/1/3/4/7/134703955/1d577adf39c1dcb.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/8517958.pdfIn PDF document text
    • https://ralifanexipoker.weebly.com/uploads/1/3/1/3/131380500/9110358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://logururud.epizy.com/identifying_parts_of_speech_practice_worksheets.pdfIn PDF document text
    • http://situvedaw.rf.gd/kilasazuzuvorageniremitex.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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 5416 bytes
SHA-256: e29a586cf37348ffe263331afcbf7fc9a5569388071c95cc9c7ffb28882ac225
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 12308 bytes
SHA-256: 8af3cc177bfed2e1668490ae79672a63a55bee03fe5e9e7937b4e6934832c411

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